The hormonal pathway in the reproduction of nonviviparous vertebrates is activated by

a. environmental cues.
b. day length.
c. pheromones.
d. all of these.
e. none of these.


D

Anatomy & Physiology

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Which muscle functions in extensions of the digits of the hand?

A) Pronator teres B) Palmaris longus C) Extensor digitorum D) Extensor carpi ulnaris

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If two sperm penetrate two different oocytes, the two resulting offspring would be fraternal ________.

Fill in the blank(s) with the appropriate word(s).

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The rungs of the DNA ladder are composed of

A. glucose-phosphate chain. B. sugar-phosphate chain. C. adenine-ribose chain. D. nitrogen base pairs.

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What material gives "white matter" its color?

A) Potassium channels B) Depolarizing axons C) Cell bodies D) Myelinated axons

Anatomy & Physiology