SAT Subject Test in Biology

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

Cell Structure and FunctionGenetics and HeredityEcology and Ecosystems
Molecular Biology and BiochemistryEvolution and Natural SelectionHuman Physiology
Biology in MedicineEnvironmental ConservationBiotechnology in Everyday Life
Time Management TechniquesActive Study StrategiesUnderstanding Question Types
Cell Structure and F...Genetics and Heredit...Ecology and Ecosyste...Molecular Biology an...Evolution and Natura...Human PhysiologyBiology in MedicineEnvironmental Conser...Biotechnology in Eve...Time Management Tech...Active Study Strateg...Understanding Questi...
Advanced Topics

Evolution and Natural Selection

The Origin of Species

Evolution explains how species change over time through natural selection—a process first described by Charles Darwin.

How Natural Selection Works

  • Variation: Individuals in a population differ.
  • Competition: More organisms are born than can survive.
  • Adaptation: Traits that help survival become more common.

Over generations, these changes can lead to new species.

Why Evolution Matters

Understanding evolution helps us explain antibiotic resistance, the emergence of new diseases, and the diversity of life.

Examples

  • Bacteria evolve resistance to antibiotics.

  • Peppered moths changed color during the Industrial Revolution.

In a Nutshell

Evolution describes how species change over time through natural selection.

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Human Physiology