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Which were the earliest oxygen-producing life-forms? a.cyanobacteria. b.seaweed. c.dinosaurs. d.ferns.
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1 vote
Which were the earliest oxygen-producing life-forms?

a.cyanobacteria.
b.seaweed.
c.dinosaurs.
d.ferns.

User Kikeenrique
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2 Answers

4 votes
A is the answer Cyanobacteria I hope this helps
User Olcay Tarazan
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5 votes
A. cyanobacteria is the answer!
User Anette
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