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Author Question: A pale yellow element occurring widely in nature is: a. iron c. sulfur b. phosphorus d. ... (Read 21 times)

jessicacav

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on: Jul 21, 2018
A pale yellow element occurring widely in nature is:
 
 

a. iron c. sulfur
  b. phosphorus d. antimony



Question 2

For human survival, approximately what percentage of the air must be oxygen?
 
 

a. 21 c. 54
  b. 77 d. 42



cam1229

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Reply #1 on: Jul 21, 2018
Answer to Question 1

C

Answer to Question 2

A


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