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Nwere Nwere
wrote...
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6 years ago
The concentration of nitrogen in the earth's atmosphere is approximately
  a. 78 percent.
  b. 66 percent.
  c. 50 percent.
  d. 33 percent.
  e. 20 percent.

Question 2

The most abundant gas in the earth's atmosphere is
  a. oxygen.
  b. water vapor.
  c. argon.
  d. nitrogen.
  e. carbon dioxide.
Textbook 
Human Biology

Human Biology


Edition: 10th
Authors:
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Replies
wrote...
6 years ago
Answer to q. 1

A

Answer to q. 2

D
Nwere Author
wrote...
6 years ago
Thanks for your help!!! Correct all the way through
wrote...
6 years ago
You're welcome Slight Smile
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