Campbell Biology in Focus (2nd Edition)
Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780321962751
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
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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Scientists think that terrestrial life probably originated in Earth's oceans becauseChoose one: A.  energy was available there. B.  all of the chemical pieces were there. C.  All of the possible answers are correct. D.  the earliest evidence for life on Earth comes in ocean-dwelling forms.
The evolution of photosynthesis resulted in a. an increase in the amount of O2 in the atmosphere. b. the initial appearance of heterotrophs. c. global warming. d. an increase in the amount of CO2 in the atmosphere
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