Which elements listed below combine to form most of the organic molecules in living things?

A) sulfur, oxygen, hydrogen, nitrogen
B) nitrogen, sulfur, oxygen, hydrogen
C) helium, carbon, nitrogen, hydrogen
D) nitrogen, carbon, oxygen, hydrogen


Ans: D) nitrogen, carbon, oxygen, hydrogen

Biology & Microbiology

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Considering that species diversity in estuaries is limited by constant changes in salinity, temperature, and water movement, where, vertically, in an estuary would one expect to find the greatest species diversity? The least species diversity?

What will be an ideal response?

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Herbivores are indicated by

a. A. b. B. c. C. d. D. e. E.

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The embryo develops into a fetus while it is within the 

A. ovary. B. cervix. C. vagina. D. uterus.

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The reverse of a dehydration synthesis reaction is a(n) ________ reaction.

A. anabolic B. exchange C. hydrolytic D. endothermic E. metabolic

Biology & Microbiology