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24 November, 06:01

What happened around 800 million years after Earth formed to allow rocks to

form?

O

A. Life began to appear.

O

B. The sun dimmed considerably.

D

C. Earth cooled sufficiently.

D. The ozone layer formed.

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Answers (2)
  1. 24 November, 06:41
    0
    A. life began to appear
  2. 24 November, 06:58
    0
    Life began to appear
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