Which of the following factors determine the distribution of the earth's habitats and ecosystems?

I. Air circulation

II. Rainfall

III. Topography

IV. Microbiological factors

V. Reproduction rates

Two types of mosses grow separately. However, when they are put in the same environment and forced to live together, one of the mosses goes extinct. This is an example of which of the following?

An ecologist is surveying a portion of land that is believed to contain a specific animal species of interest. If the ecologist is measuring the number of this animal species per square meter, what is she measuring?

The sea otter plays an important role in controlling the sea urchin population in the Pacific Ocean. While they are not abundant in numbers, they play a vital role. The sea otter is an example of which of the following concepts?

Which of the following is an internal factor that impacts ecosystems?

Which of the following is true regarding keystone species?

Which of the following describes a community?

Which of the following is not considered to be a component of an ecosystem?

Forest 1 has A, B, C, and D trees. There are five A trees, nine B trees, ten C tree, and six D trees. Forest 2 has A, C, and D trees. There are ten A trees, fourteen C trees, and seven D trees. Forest 1 demonstrates __________ over forest 2.

Which of the following is true regarding tropical rainforest biomes?