Which of the following substances is released outside of the body in its normal route of action?

A) paracrine signal
B) neurotransmitter
C) prostaglandin
D) pheromone
E) growth factor


Answer: D

Biology & Microbiology

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If two species of lizards do not mate because their mating rituals differ greatly, they are exhibiting ____ reproductive

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Describe the movement of oxygen and carbon dioxide during gas exchange.

A. Oxygen diffuses out of the lungs into red blood cells and carbon dioxide diffuses out of red blood cells into the kidney nephrons. B. Carbon dioxide diffuses out of the lungs into red blood cells and oxygen diffuses out of red blood cells and into the lungs. C. Oxygen diffuses out of the lungs into red blood cells and carbon dioxide diffuses out of red blood cells and into the lungs.

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What are prototrophs?

What will be an ideal response?

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Current research in behavioral ecology focuses on the overall contribution that behavior makes to an animal's

A. competitive strategies. B. learning. C. length of life. D. foraging efficiency. E. fitness.

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