The evidence that scientists currently have suggests that life on earth __________.

a. began in the water

b. first evolved around 3,500 million years ago

c. began as single-celled organisms

d. a and b

e. all of the above

Life could not arise in the continents because at the time there was no ozone layer. Intense u.v rays alter dna generating mutations that would not allowed for species to thrive.

Fossil records (prokaryotes) from 3.5 billion years ago have been found, these fossil show single cell organisms.

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The evidence that scientists currently have suggests that life on earth __________. a. began in the water b. first evolved around 3,500 million years ago c. began as single-celled organisms d. a and b e. all of the above

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The evidence that scientists currently have suggests that life on earth __________.

a. began in the water

b. first evolved around 3,500 million years ago

c. began as single-celled organisms

d. a and b

e. all of the above