Biologists Are Studying the Anatomy of a Newly Discovered Whale

question 13

Multiple Choice

Biologists are studying the anatomy of a newly discovered whale whose carcass has washed up on shore.In examining a cross section of its flipper,they notice a vein and an artery running in parallel.The artery can be distinguished from the vein because the artery has

• A) a larger interior diameter.
• B) more muscle tissue and elastin in the wall.
• C) a lining of vascular endothelium.
• D) valves to prevent backflow.
• E) All of the above

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Definitions:

Intraspecific

Pertaining to interactions or relationships occurring within the same species, such as competition or mating.

Negative Feedback

A regulatory mechanism in which a stimulus causes an opposite output in order to maintain an optimal level of whatever is being regulated.

Density Dependent

Factors whose effects on the size or growth of the population vary with the population density.

Fecundity

The potential capacity of an individual to produce offspring.