Which four elements make up approximately 96% of living matter?
A) Carbon, hydrogen, nitrogen, oxygen
B) Oxygen, hydrogen, calcium, sodium
C) Carbon, phosphorus, hydrogen, sulfur
D) Carbon, sodium, chlorine, magnesium
E) Carbon, oxygen, calcium, sulfur
Correct Answer:
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A) gain
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Q19: An atom's nucleus is composed of
A) neutrons
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A) more than
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