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Which of the following organisms have existed on Earth for the longest period of time? O single-celled organisms O multicellular organisms O dinosaurs O mammals
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23 votes
Which of the following organisms have existed on Earth for the longest period of time?

O single-celled organisms
O multicellular organisms
O dinosaurs
O mammals

User Killogre
by
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2 Answers

9 votes

Answer:

cyanobacteria.. single celled organisms

User Gionni
by
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12 votes

Answer:

single-celled organisms

Step-by-step explanation:

User Rexroxm
by
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