SAT Subject Test in Biology

The SAT Subject Test in Biology assesses students' understanding of biological concepts and principles.

Cell Structure and FunctionGenetics and HeredityPhotosynthesis and Cellular Respiration
Evolution and Natural SelectionEcology and EcosystemsHuman Body Systems
Biotechnology in MedicineConservation and Environmental ProtectionGenetic Testing and Personalized Medicine
Time Management and PacingProcess of Elimination
Cell Structure and F...Genetics and Heredit...Photosynthesis and C...Evolution and Natura...Ecology and Ecosyste...Human Body SystemsBiotechnology in Med...Conservation and Env...Genetic Testing and ...Time Management and ...Process of Eliminati...
Advanced Topics

Ecology and Ecosystems

Living Together: The Web of Life

Ecology is the study of how living things interact with each other and their environment. An ecosystem includes all the living (biotic) and non-living (abiotic) things in an area.

Levels of Organization

  • Population: Group of the same species in one area.
  • Community: All different species in one area.
  • Ecosystem: The community plus the physical environment.

Food Chains and Webs

Energy flows through ecosystems from producers (plants) to consumers (animals) and decomposers (fungi, bacteria).

Real-World Applications

Ecology helps us understand environmental issues like climate change, pollution, and conservation.

Examples

  • Bees pollinate flowers, supporting both species and the larger ecosystem.

  • Removing a top predator can disrupt the food web and ecosystem balance.

In a Nutshell

Ecology explores how organisms interact with each other and their environment, forming complex ecosystems.

Key Terms

Biotic
Living components of an ecosystem.
Abiotic
Non-living components of an ecosystem.
Biodiversity
The variety of living things in an ecosystem.
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Human Body Systems