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3.5 bya

4.5 bya

3.4 bya

10,500 ya

2.4 mya

4.1 bya

700 mya

4.6 bya

450 mya

1804

200,000 ya

2.1 bya

Evidence of life

First eukaryotic cells

Moon formed

Ozone sufficient for land organisms

First photosynthetic organisms (O2 accumulates)

Homo sapiens

World population 1 billion

Multicellular organisms

Homo appears

First prokaryotic cells

Earth formed

Agriculture