When did life originate on Earth?

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Answer 1 · 2016-09-30T01:44:24

See explanation.

Some scientific surmises;

First whiff of oxygen: 3.2 billion years ago (bya)

Unicellular life: 2 bya

Unicellular # to # multicellular evolution: less than 2 bya

Sea life: 650 million years ago (mya)

Leg-bearing worms:570 mya

Wattizea tree:380 mya

Animal movement from land to sea:400-365 mya

Insects:359-299 mya

Mini-winged dinosaurs:160 mya

Bates:50 mya

Anthropoid (resembling human )primate Ida (female): 47 mya

Indubitably, you and I: Now.: