CAMPBELL BIOLOGY IN FOCUS-MOD.MASTERING
CAMPBELL BIOLOGY IN FOCUS-MOD.MASTERING
3rd Edition
ISBN: 9780135191811
Author: Urry
Publisher: PEARSON
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Chapter 24, Problem 2TYU

Fossilized stromatolites

  1. A.    more than 2.8 billion years old have not been discovered.
  2. B.     formed around deep-sea vents.
  3. C.     resemble structures formed by bacterial communities that are found today in some shallow marine bays.
  4. D.    provide evidence that photosynthesis was occurring in the oceans by 2.5 billion years ago.
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