The most important feature that permits a gene to act as a molecular clock is _____.

The most active form of ____________ is called calcitriol.

(intro) the amount of life on the ocean floor depends primarily on _________.

In the myogenic response, ________.

Opportunistic species typically ______.

Adh level in nephrons regulates water output by causing the _____.

Analogous structures _____.

Anaerobic respiration produces a maximum of ______ atp per glucose

An upward closing fold is called a/an _____.

An organism that cannot synthesize methionine is an example of __________.

An observation is _______