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Author Question: Why are periods the most fundamental time unit? What will be an ideal ... (Read 29 times)

anshika

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on: Jul 29, 2018
Why are periods the most fundamental time unit?
 
  What will be an ideal response?

Question 2

The Precambrian witnessed the development of
 
  A) the first atmosphere.
  B) the ozone layer.
  C) photosynthesis.
  D) photosynthesis, an oxygenated atmosphere, and the ozone layer.


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bfulkerson77

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Reply #1 on: Jul 29, 2018
Answer to Question 1

Answer: Periods are small enough time units to chronicle major changes in life forms. Eras are far too big, and epochs are too small.

Answer to Question 2

Answer: D


anshika

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Reply 2 on: Jul 29, 2018
YES! Correct, THANKS for helping me on my review

abro1885

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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