BIO.4.1 · Block 10.1

Chemical vs. Organic Evolution

Drag the slider to move through the history of life one step at a time. Watch where nothing is alive yet (chemical evolution) and where living things begin to change (organic evolution).

Steps are shown in order, not to scale — the real timeline spans billions of years. The Miller–Urey experiment shows that organic molecules can form under modeled early-Earth conditions; it does not prove exactly how life began.