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lora16 [44]
3 years ago
15

When was oxygen first produced?

Biology
2 answers:
sp2606 [1]3 years ago
5 0

2.45 billion years ago

Explanation:

but was discovered in 1772

Wewaii [24]3 years ago
3 0

Answer:

2.45 billion years ago

Explanation:

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Explanation: provides protection for a cell

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Sperm + egg----- zygote.

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