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Author Question: Why do we believe the Cambrian explosion occurred so suddenly? A) oxygen concentrations reached ... (Read 139 times)

altibaby

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on: Jul 27, 2018
Why do we believe the Cambrian explosion occurred so suddenly?
 
  A) oxygen concentrations reached critical levels necessary to support more complex life
  B) organisms became sufficiently complex that more diversity became possible
  C) climate change due the end of the last snowball Earth phase
  D) all of these

Question 2

In the outer regions of the solar nebula where temperatures were low,
 
  A) only rock and iron could condense
  B) only hydrogen compounds could condense as ices
  C) hydrogen and helium gases were able to condense
  D) in addition to rock and iron, hydrogen compounds also condensed as ices


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recede

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Reply #1 on: Jul 27, 2018
Answer to Question 1

D

Answer to Question 2

D


altibaby

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Reply 2 on: Jul 27, 2018
Excellent

sultana.d

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

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