Question

Large amounts of oxygen gas appeared in Earth's atmosphere about 2.7 bya years ago, ...

A.after photo-autotrophic prokaryotes evolved

B.after eukaryotes evolved

C.before anaerobic organisms evolved

D.after the first organisms colonized land

Answer 1

Answer:

after photo-autotrophic prokaryotes evolved

Answer 2

Large amounts of oxygen gas appeared in Earth's atmosphere about 2.7 billion years ago after photo-autotrophic prokaryotes evolved.

What is the reason that Large amounts of oxygen gas appears about 2.7 billion years ago?

• The reason that large amounts of oxygen gas appear is that after the evolution of photo-autotropic prokaryotes.
• Photoautotrophs are cells that capture light energy.
• Photoautotrophs used carbon dioxide as their carbon source.
• There are many examples of Photoautotrophic prokaryotes like cyanobacteria.
• Photoautotrophic prokaryotes use similar compounds to those of plants to trap light energy.

Hence, after photo-autotrophic prokaryotes evolved is the correct answer.

Therefore, option A is the correct answer.

Learn more about photo-autotrophic prokaryotes, refer to:

https://brainly.com/question/15469268

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