Where did life come from?
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An investigation: what is settled about how life works and changes, and what is still open about how it began.
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Settled: how life works and changes
Still debated
Question
How did the first living things arise from non-living chemistry?
Hypothesis
Abiogenesis: The Origin of Life
Proven
The DNA Double Helix
Theory
Evolution by Natural Selection
Theory
The Modern Evolutionary Synthesis
Contested
Junk DNA
Natural selection explains how life changes once it exists. It does not, on its own, explain how it started.