We Observe a Remarkable Increase in Brain Size in the Order

question 48

Multiple Choice

We observe a remarkable increase in brain size in the order primates.What is this associated with?

• A)Primates have long growth and development periods to accommodate the development of complex behaviors in individuals.
• B)Primates have shorter developmental periods to accommodate the necessary energy expenditures of larger brain size.
• C)Primate brain size is determined primarily by genetic drift and has no clear adaptive role,other than in humans.
• D)The relatively large brain in primates is due to the expansion of the olfactory system during primate evolution.

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Definitions:

Sternocleidomastoid

A neck muscle that flexes and rotates the head, visible when turning the head or when strained.

Palatoglossus

A muscle that elevates the back of the tongue and narrows the oropharyngeal isthmus, playing a role in swallowing and speech.

Soft Palate

The fleshy, flexible part toward the back of the roof of the mouth, separating the mouth from the pharynx.

Sternocleidomastoid

A muscle in the neck that runs from the sternum and clavicle to the mastoid process of the temporal bone, involved in rotating and flexing the head.