Although All of the Following May Have Been Critical to the Development

question 22

Multiple Choice

Although all of the following may have been critical to the development of an expanding brain, which do scientists believe would have contributed most directly to brain growth?​

• A)​the migration into colder and less known areas placing a premium on learning
• B)​a genetic mutation resulting in a smaller jawbone and smaller facial muscles
• C)​the detoxification of foods, allowing humans to live to significantly older ages
• D)​the ability to conquer predators, allowing humans higher meat consumption levels

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Definitions:

Right Atrium

The right upper chamber of the heart that receives deoxygenated blood from the body via the venae cavae.

Fenestrated Capillaries

Capillaries with small pores in their endothelial lining allowing for increased permeability to fluids and small molecules, found in areas requiring extensive exchange such as in kidneys and endocrine glands.

Kidney

A pair of organs located in the abdominal cavity that filter blood, remove waste products, and regulate fluid balance.

Pancreas

A glandular organ in the digestive system that produces insulin, digestive enzymes, and other hormones.