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Author Question: When Earth was young, its atmosphere had no free ____. a. nitrogen b. oxygen c. helium d. carbon ... (Read 32 times)

fbq8i

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on: Jul 27, 2018
When Earth was young, its atmosphere had no free ____.
 
  a. nitrogen
 b. oxygen
 c. helium
 d. carbon dioxide
  e. water vapor

Question 2

As a star like the Sun exhausts hydrogen in its core, the outer layers of the star become hotter and more luminous.
 
  a. True
  b. False
  Indicate whether the statement is true or false


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gstein359

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

b

Answer to Question 2

False


fbq8i

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Reply 2 on: Jul 27, 2018
Gracias!

carlsona147

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Reply 3 on: Yesterday
Excellent

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