1 which of the following is not believed to have been a


Choose the correct answer.

1.) Which of the following is NOT believed to have been a component of the early Earth's atmosphere?

N2 (nitrogen gas)

H2 (hydrogen gas)

CO2 (carbon dioxide)

O2 (oxygen gas)

2.) Which evolutionary innovation allowed animals to grow bigger bodies by adding appendages for specialized functions?

a head

segmentation

complete digestive system

bilateral symmetry

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Biology: 1 which of the following is not believed to have been a
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