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How did earth change about 2.5 billion years ago when many organisms began using photosynthesis to make food A. The amount of oxygen in the atmosphere increased B. Mass extincti…

How did earth change about 2.5 billion years ago when many organisms began using photosynthesis to make food A. The amount of oxygen in the atmosphere increased B. Mass extincti…
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How did earth change about 2.5 billion years ago when many organisms began using photosynthesis to make food

A. The amount of oxygen in the atmosphere increased

B. Mass extinctions occurred

C. The oceans became larger

D. Rainfall increased

User Dactyrafficle
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1 Answer

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The amount of oxygen in the air was increased
User Adil Hindistan
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