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Home Q & A Board Biology-Related Homework Help General Biology
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JNASTY123 JNASTY123
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6 years ago
The eukaryotes first appear in the fossil record
  about ____ million years ago.
 
  a. 1.8
  b. 2.2
  c. 2.7
  d. 3.6
  e. 1.5

Question 2

Increase in the population of photosynthetic
  bacteria using the oxygen-releasing pathway
  led to an increase in the oxygen levels in the
  seas and air. What was (were) the major
  consequence(s) of that change?
  I. aerobic respiration became the major
  mode of life
  II. all anaerobic organisms went extinct
  III. formation of ozone layer
 
  a. I only
  b. II only
  c. I and II
  d. I and III
  e. I, II, and III
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StewartStewart
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#1
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6 years ago
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JNASTY123 Author
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#2
6 years ago
Makes more sense now, TY
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