Diversity of life — Introduction to Evolution + 6 more topics

Evolution explains how life on Earth has changed and diversified over millions of years. It's a fundamental concept in biology, providing a framework for understanding everything from tiny bacteria to complex ecosystems.

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For a long time, the dominant view was that species were fixed and unchanging, often seen as divinely created. This idea is known as fixity of species. However, even ancient thinkers observed similarities and differences among living things, leading to early attempts at classification.