A Gorilla Encounters a Frightening Stimulus; Its First Reactions May

question 90

Multiple Choice

A gorilla encounters a frightening stimulus; its first reactions may include a sudden jump followed by immobility. It may also display _____, meaning that its body hair stands on end; this makes the animal look bigger and more threatening.

• A) sphincter control
• B) piloerection
• C) goosebumps
• D) bladder control

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Definitions:

Australopithecines

A group of extinct hominids that lived in Africa from about 4 to 2 million years ago, known for walking upright and for being possible ancestors of modern humans.

Body Size

The physical dimensions, volume, or mass of an organism, which can have various effects on its biology and behavior.

Musculature

The system or arrangement of muscles in the body of an organism, crucial for movement and physical activities.

Brain Size

A measure of the volume or mass of the brain, often related to body size, which varies significantly among different species and can correlate with cognitive abilities.