All of Earth's life-forms are based on:
a. hydrogen
b. nitrogen
c. oxygen
d. carbon
e. phosphorus
Answer: carbon
All of Earth's life-forms are based on:
a. hydrogen
b. nitrogen
c. oxygen
d. carbon
e. phosphorus
Answer: carbon
a. hydrogen
b. nitrogen
c. oxygen
d. carbon
e. phosphorus
Answer: carbon
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