Theory

Definition

A theory is a well-substantiated explanation of some aspect of the natural world, based on a body of evidence and repeatedly tested through observation and experimentation. Theories are broader in scope than hypotheses and can generate new hypotheses.

5 Must Know Facts For Your Next Test

1. Theories in biology are supported by extensive evidence gathered over time.
2. A theory can be modified or rejected if new evidence contradicts it.
3. Examples of biological theories include the Theory of Evolution and Cell Theory.
4. Theories help to explain natural phenomena and predict future occurrences.
5. The development of a theory involves multiple steps including observation, hypothesis formation, experimentation, and validation.

Review Questions

• What differentiates a scientific theory from a hypothesis?
• Name two examples of theories in biology.
• How can a scientific theory change over time?

Related terms

Hypothesis: A tentative explanation that can be tested through experiments and observations.

Law: A statement based on repeated experimental observations that describes some aspect of the world.

Evidence: Data collected through observations and experiments used to support or refute a hypothesis or theory.