(A) Hydrogen (X)
(B) Nitrogen (X)
(C) Carbon ()
(D) Ammonia (X)
Answers: The molecules of living matter that provide building blocks are mostly based on Carbon.
(A) Hydrogen (X)
(B) Nitrogen (X)
(C) Carbon ()
(D) Ammonia (X)
Answers: The molecules of living matter that provide building blocks are mostly based on Carbon.
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