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3.7 Fitness

Part of Cellular Energetics in AP® Biology. Read the opening section, then create a free account for the full interactive lesson, practice, and progress tracking.

Molecular Variation and Its Role in Survival and Reproduction

The ability of organisms to adapt and thrive in different environments is deeply connected to the variation in the types and quantities of molecules within their cells. These variations allow organisms to respond effectively to environmental stimuli, enhance survival in changing conditions, and ensure successful reproduction.

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