What was utilized by photoautotrophs during photosynthesis when H2O wa

1.	What was utilized by photoautotrophs during photosynthesis when H2O was absent?
A.	HF
B.	HCl
C.	H<sub>2</sub>S
D.	H<sub>2</sub>N<sub>2</sub>
Answer» D. H<sub>2</sub>N<sub>2</sub>

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