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Ecosystems are made of a complex system of energy and nutrient transfers from one organism to another. Some of these transfers are in the form of predation - one organism eating another – while others are in the form of ecosystem engineering, an organism changing the environment around them. One major form of ecosystem engineering is niche creation. Niche creation is the process of an organism changing their environment to create a competitive advantage. In order for an organism to be considered as creating a niche, three things must be true: the organism must significantly modify their environment, those changes must affect other organisms’ survival, and those changes must lead to an evolutionary response in another organism.
What is the most effective way to combine the two underlined sentences at the underlined portion?
When you are asked the best way to combine two sentences, remember that the way the sentence is given is technically correct, and that you are looking for an option that is both grammatically correct and is concise. Option "creation, the process of" is the only option that is both. Choice "creation, processing" is illogical since it implies that niche creation itself is changing the organism. Choices "creation, which is the process by which" and "creation – the process through which" are redundant and wordy. Since "creation, the process of" is both concise and grammatically correct, it is an effective way to combine the sentences.
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\[1\] The job of CRM archaeologists is to identify the potential cultural significance of a site and then document and preserve any artifacts of historical or cultural significance. \[2\] The surplus of people who want to work in archaeology has meant that the majority of archaeologists aren’t employed by universities or museums, but by construction companies and the government. \[3\] Most archaeology positions in today’s economy are for what are referred to as a “cultural resource management” archaeologists, or CRM archaeologists, who are often involved in building projects as representatives of the 1 state, Native American tribes, and historical societies. \[4\] While part of this analysis might involve starting a dig at the site in question to find relevant artifacts, much of this research process requires CRM archaeologists to consult historical records and talk to members of the community where the building process has been proposed.
Whenever you are writing a list of three or more items, you generally will need to separate each item in the list with a comma. (Note that the SAT doesn't test the Oxford comma, so you don't need to worry about whether you need a comma before the "and" in any list.) The exception to this rule is if you have a complex list, especially one containing commas in the individual items. In that case, you can choose to instead separate each item with a semicolon. No matter which you use, however, the key is that you remain consistent. Since this isn't a complex list, the semicolon isn't allowed - each item in the list would be comprehensible with only a comma. This allows you to eliminate "state; Native American tribes;". And since " state; Native American tribes," and " state, Native American tribes;" mix the use of a semicolon and comma, you can also eliminate both of those since you must have consistency within the list. Only as it is written (NO CHANGE) correctly uses commas to separate each item in the list.
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A series of paintings in the museum depicting the heroes of the disaster that occurred nearly a decade ago.
In this example, using the term “depicting,” whether we include the comma in “paintings in the museum, depicting,” or eliminate it as in the original construction, introduces a participial modifier. This modifier correctly refers back to the series of paintings in the museum, but leaves the sentence without a conjugated verb. The construction “paintings in the museum, which depicted” makes a similar mistake, as the relative clause “which depicted” also leaves the sentence without a verb in verb form. The correct answer, “paintings in the museum depicted,” corrects this error, as the past tense verb “depicted” creates a complete sentence and agrees with the subject, “a series of paintings.”
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He assumed that his mother, her having lived through similar events in the past, would understand his concerns.
In this example, the existing phrasing, “her having,” appears to be an attempt to construct a participial modifier referring back to “his mother,” but the inclusion of the pronouns “her” renders the choice redundant and grammatically incorrect. The choice “she had” creates an independent clause within the commas, which cannot occur grammatically inserted into the middle of a sentence. The choice “which” renders the clause within the commas a relative clause, which might seem correct, but “which” seems to convey the incorrect sense that “his mother” is an inanimate object. The choice “who had,” on the other hand, similarly introduces a relative clause which correctly signifies that “his mother” is a person, and it is accordingly the best choice.
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Deep in the rainforests of the Amazon, vibrant plant life of many shapes and sizes that flourishes in unexpected places.
In this example, the existing phrasing, “that flourishes,” makes the remainder of the sentence a relative clause which describes the “vibrant plant life.” However, this choice leaves the sentence without a conjugated verb, making it an ungrammatical fragment. Deleting the underlined portion makes “in unexpected places” a prepositional phrase to describe the “vibrant plant life,” but the sentence is similarly left without a conjugated verb. The choice “flourish” is problematic because of subject-verb disagreement between “vibrant plant life,” which is singular, and “flourish,” which is conjugated to agree with a plural subject. Alternatively, the choice “flourishes” provides the sentence with correctly conjugated subject-verb agreement.
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Because the results of the study were inconclusive the researchers were never able to garner further financial support.
In this example, the choice which includes a comma followed by “and” is incorrect because of the relationship between the two clauses. Because the first clause begins with the subordinating conjunction “because,” it introduces a subordinate clause, which should be set off by a comma when it precedes an independent clause. The inclusion of “and,” however, means that a subordinating conjunction and a coordinating conjunction are used, ungrammatically, in tandem. The choice which includes “then” and no comma is wrong on two counts, as it fails to include a comma to separate the subordinate and independent clause, and the use of “then,” which indicates causation, is redundant with the subordinating conjunction “because,” which has already signaled a causal relationship. The existing phrasing, with no conjunction and no comma, is incorrect because a comma is necessary between an independent clause and a subordinate clause which precedes it. Accordingly, the choice with the comma and no conjunction is these, as there is no redundancy in conjunctions and the comma correctly separates the two clauses.
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Tasked with completing the blueprints himself, Jefferson soon found himself overwhelmed with work.
In this example, the choice which uses a semicolon suggests that both clauses are independent. The first clause, however, cannot stand alone as a complete sentence, as it does not contain a conjugated verb. For a similar reason, the choice which uses a comma and “so” can be discarded. A comma followed by a coordinating conjunction like “so” can only separate independent clauses, and as previously discussed, the first clause is not a full sentence. The choice which uses “because,” a subordinating conjunction, is also incorrect, as it suggests that the second clause is subordinate, but the first clause is not an independent clause, and subordinate clauses cannot appear unless adjacent to independent clauses. The correct choice, then, is the existing phrasing, containing only a comma, as it correctly marks the first clause as a participial clause followed by an independent clause.
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Charlie Parker, one of the pioneers of bebop style, which changed jazz music for decades to come.
In this example, the existing phrasing is ungrammatical, as an appositive clause is followed by a relative clause. In context, “one of the pioneers of bebop style” is an appositive clause which describes who “Charlie Parker” is, and it is followed by “which,” a relative pronoun which marks the remainder of the sentence as a relative clause describing “bebop style.” This choice, however, contains no conjugated verb, making the sentence a fragment. The choice to replace the comma with a semicolon, retaining “which,” is no better, as it suggests the clauses preceding and following the semicolon are independent, which they are not. The choice with no punctuation makes the sentence after “Charlie Parker” appear to stand alone as an independent clause, but this leaves a noun set off by a comma at the beginning of the sentence, for which there is no grammatical justification. The correct choice includes only a comma, as it correctly makes “one of the pioneers of bebop style” into an appositive clause which describes Charlie Parker, while the remainder of the sentence contains a conjugated verb and a description of how he changed jazz “for decades to come.”
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There is no reason that Americans, who have often interfered with international politics in the past and have a hand in this situation.
In this example, the existing phrasing means that everything which follows “who,” a relative pronoun, should be interpreted as part of the relative clause, as there is no other comma in the sentence to mark the end of the clause. This leaves the sentence erroneously incomplete, as the complementizer “that” suggests that something Americans have “no reason” to do will be introduced after the relative clause. In examining the other choice which doesn’t contain a comma, it appears similarly erroneous, as the relative clause continues through the end of the sentence, never revealing what it is that Americans have “no reason” to do. The choice containing “to have” seems like it might work, as the relative clause is closed with a comma, but in removing the relative clause to examine the remaining sentence, “no reason that Americans to have a hand” remains, and it becomes clear that the complementizer “that” and the infinitive construction “to have” do not function together. The final choice, with “should have,” uses the relative clause correctly, and in removing it, we are left with “no reason that Americans should have a hand,” which is entirely grammatically correct.
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Plenty of experts from within the industry testified on the subject at the hearing.
In this example, the choice containing “who” and “which” both suggest that the information to follow is part of a relative clause. The comma before “which” suggests that the clause is non-restrictive, while the absence of a comma before “who” suggests that the clause is restrictive. In either case, however, the sentence is left without a conjugated verb, so neither choice is the correct one. The choice “industry has testified” might seem right, as there appears to be a conjugated verb, but there is subject-verb disagreement between “experts,” which is plural, and “has,” which is singular. The existing phrasing, on the other hand, has correct subject-verb agreement, meaning the sentence contains a conjugated verb and is otherwise grammatically correct.
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The Sagrada Familia has stood, incomplete, as part of the Barcelona skyline since the early phases of its construction in 1882. The project, originally intended to be a cathedral in the gothic style, was begun by the bookseller Joseph Maria Bocabella under the direction of the architect Francisco de Paula del Villar. Del Villar and Bocabella imagined a basilica modeled on the Gothic revival churches Bocabella had seen on trips to Italy. However, Bocabella’s ideal basilica never came to be. In 1883 del Villar resigned from the project, and 30-year old Antoni Gaudi, 1 he was a young but already well-known architect from Catalonia, took over as lead architect.
Whenever you are asked to join two thoughts with a comma, you should make sure that the sentence that is created is both not a run-on and a complete sentence. In this case, your hint should be the second comma after "Catalonia" later in the sentence. The portion directly after the first comma is meant to be a piece of additional information bracketed within commas. It therefore shouldn't have a verb, since having a verb would create a run-on sentence. That should allow you to eliminate all choices except for "DELETE the underlined portion."
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The Sagrada Familia has stood, incomplete, as part of the Barcelona skyline since the early phases of its construction in 1882. The project, originally intended to be a cathedral in the gothic style, was begun by the bookseller Joseph Maria Bocabella under the direction of the architect Francisco de Paula del Villar. Del Villar and Bocabella imagined a basilica modeled on the Gothic revival churches Bocabella had seen on trips to Italy. However, Bocabella’s ideal basilica never came to be. In 1883 del Villar resigned from the project, and 30-year old Antoni Gaudi, a young but already well known architect from Catalonia, took over as lead architect.
Gaudi decided to depart from del Villar’s original Gothic design in favor of a more modern design. The new design was 1 ambitious, and featuring eighteen tall spires and four different facades on different sides of the basilica. But work on the new building was slow. Decades passed, and the work was still incomplete. In 1915, Gaudi - now 63 years old - abandoned all other work in favor of dedicating himself to the completion of the monumental church, but progress on the building was still slow. When pressured to speed up work on the monumental building, Gaudi was said to have replied, “My client is not in a hurry.” By the time Gaudi died in 1926, the basilica was only somewhere between 15 and 20 percent complete.
This sentence presents you with two major decision points: between the comma and semicolon and between "and featuring" and "featuring". Check the difference between the comma and semicolon first. Remember that a comma cannot be used to link two complete sentences without a conjunction and that a semicolon can only be used to link two complete sentences. "ambitious; featuring" can be eliminated since what follows the semicolon is not a complete sentence, and "ambitious, it featured" can be eliminated because there is a complete sentence on either side of the comma without a conjunction. Since the sentence is not a list and what follows after the comma isn't a complete sentence, "and featuring" does not make sense. "ambitious, featuring" turns the second part of the sentence into an appositive, allowing you to use the comma.
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Astronomers of the late twentieth century discovered several distant, planet-like objects orbiting the sun, which has led to heated debates over which of these objects are deserving of the classification “planet.”
In this example, we are presented with several modifiers across our answer options. The relative clause introduced by “which” must refer to the noun or noun phrase that comes before the comma. Since it is illogical to say that the sun has lead to heated debates, we can eliminate all answers that lead with the relative clause “, which.” This leaves us with only our correct answer: “leading to heated debates over which of these objects deserve.” Since this option replaces the relative clause “, which” with a participial phrase beginning with “leading,” we are now able to modify the subject or subject containing clause. In this case, this construction is necessary to modify the fact that astronomers discovered the objects, the logical meaning of this sentence.
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As children, we used to sit in the meadow behind the corner store on top of an old well and eat penny candy and homemade caramels.
In this example, we need to identify the order of modifying phrases that correctly expresses a logical meaning. Here, each of our modifiers should be as close as possible to what they’re trying to modify. The logical meaning, in this case, expresses that we used to sit “on top of an old well,” that the old well is described as “in a meadow,” and that the meadow is “behind the corner store. Thus, “on top of an old well in the meadow behind the corner store” is the correct and logical answer. All other answer choices seem to incorrectly (and illogically) modify either the meadow or the corner store as “on top of an old well.”
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Alarmed by the recent decline of the stock market, many retirement investments have been switched from stocks to more conservative options, such as money market funds.
In this example, we need the introductory, participial modifier “alarmed by the recent decline of the stock market” to logically modify something that has the potential to be “alarmed.” In the original construction, “alarmed by the recent decline of the stock market” seems to modify “many retirement investments.” This is an illogical construction, as investments don’t have the capacity to be alarmed. With this in mind, we can eliminate answers beginning with “many retirement investments” and consider only those that begin “many retirement investors.” From here, we can eliminate the option “many retirement investors have been switched from stocks,” as the investors are not being switched, they are switching stocks. So, we’re left with “many retirement investors have switched their stocks,” the only logical construction out of our options.
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Published since 1851, the founders of the New York Times were George Jones, who had no previous journalism experience, and Henry Jarvis Raymond.
In this example, we’re being tested on the use of the participial modifier “published since 1851.” What follows the comma for this introductory modifier should be what the sentence is attempting to describe as “published since 1851.” Since the logical meaning of the sentence should suggest that “the New York Times” was “published since 1851,” not “the founders,” we can eliminate all wrong answers, and we’re left with “the New York Times was founded by,” our correct answer.
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A severe snowstorm struck the town yesterday, which forced the city council to cancel the annual parade.
In this example, we’re being tested on the modifier type introduced by the underlined portion of the sentence. In the original construction, and in all answer options that begin with “which,” we introduce a relative clause that must logically refer back to the noun or noun phrase directly before. Since “yesterday” did not force the city council to cancel the parade, we can eliminate any option that utilizes the relative modifier “which.” This leaves us with the correct answer, “forcing.” since participial (-ing) modifiers at the end of a sentence can refer back to the subject or subject-containing clause, in this case, “a severe snowstorm.”
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Astronomers of the late twentieth century discovered several distant, planet-like objects orbiting the sun, which has led to heated debates over which of these objects deserve the classification “planet.”
In this example, we’re being testing on the application of different types of modifiers. In the existing structure, the relative clause modifier, “which has led to heated debates” must refer back to the noun or noun phrase that comes before the comma. Since the sentence could not logically be referring to “the sun” with this modifier, any construction with “which” is incorrect. The correct answer replaces the relative clause with the participial modifier “leading to,” which can refer back to the subject or subject-containing clause, the desired structure in this case.
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With a safe habitat in which to repopulate and thrive, the peregrine falcon has had the ability to recover from endangered status.
In this example, we’re being tested on the use of the introductory modifier “with a safe habitat in which to repopulate and thrive.” This modifier must be followed by what the sentence is logically trying to modify. The original construction, “the peregrine falcon has had the ability to recover from endangered status” logically modifies the peregrine falcon as “with a safe habitat in which to repopulate and thrive,” and also maintains subject-verb agreement. All other answer options either illogically modify “the endangered status” or “the ability” as “with a safe habitat in which to repopulate and thrive,” or incorrectly pair the subject “the peregrine falcon” with the plural verb phrase “have had.”
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Performing in front of a crowd for the first time, the audibility of Mike’s voice was difficult over the screeching din of loudspeaker feedback.
In this example, we’re being tested on the use of the introductory participial modifier “performing in front of a crowd for the first time.” To logically complete the sentence, what follows the comma must be something that can be described as “performing in front of a crowd for the first time.” In the original construction, the sentence attempts to modify “the audibility,” making the introductory modifier illogical. In our other incorrect answers, the sentence illogically modifies “Mike’s voice” as “performing in front of a crowd for the first time. This is also an illogical and thus incorrect construction. Our correct answer, “Mike had difficulty making his voice audible,” correctly modifies “Mike” as “performing in front of a crowd for the first time."
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