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Author Question: When Earth was young, its atmosphere had no free ____. a. nitrogen b. oxygen c. helium d. carbon ... (Read 42 times)

fbq8i

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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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Answer to Question 1

b

Answer to Question 2

False




fbq8i

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Reply 2 on: Jul 27, 2018
:D TYSM


abro1885

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Reply 3 on: Yesterday
Gracias!

 

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