Food chains and food webs explain the flow of energy through ecosystems.

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Learn about Darwin's theory of evolution and natural selection on Khan Academy.

Master Algebra I with Khan Academy's interactive lessons and practice exercises, covering key concepts and problem-solving techniques.

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Introduction to lipids, their molecular structure, types, and functions.

Transcription is the process of copying a segment of DNA into RNA.

The page provides information on r and K selected species in ecology and natural systems.