Question

Scientists believe that early plants released oxygen in a process called photosynthesis. Where did the carbon dioxide

needed for photosynthesis come from in the early atmosphere?
A)
Volcanoes released carbon dioxide
B)
The Earth captured carbon dioxide from space with its gravity.
C)
Water molecules on the Earth were broken to release carbon dioxide.
D)
Early bacteria and plants released carbon dioxide as well as oxygen when
they performed photosynthesis

Answer 1

D is the answer to this question

Answer 2

Early bacteria and plants released carbon dioxide as well as oxygen when they performed photosynthesis. because bacteria could have been aerobic back then and released carbon dioxide for the plants to use in photosynthesis.

Hope this helps