what is the first life according to the fossil record?

what was like the atmosphere more than 3 billion years ago?

what is the reason for the appearance of oxygen in the atmosphere?

what is the Cambrian Explosion?

select the right order of events

why are fossils important

''only living organisms can produce other living organisms''

the theory of simple organic molecules formation explains:

the theory of spontaneous generation

according to the endosymbiont theory

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