Why Is the Advent of Bipedalism Considered Such a Significant

question 145

Multiple Choice

Why is the advent of bipedalism considered such a significant event in human evolution?

• A)Because only bipedal organisms have large brains, indicating that they are capable of becoming intelligent
• B)Because bipedalism initiated a cascade of evolutionary events that resulted in the evolution of our large brains
• C)Because standing upright helped our ancestors evade predators
• D)Because the morphological adjustments required for bipedalism resulted from genetic changes that also resulted in cranial evolution, allowing for a larger brain case.

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Definitions:

Incentives

External objects or external goals, rather than internal drives, that motivate behaviors.

Drive Reduction

A motivation theory that suggests behavior is motivated by the desire to reduce internal drives of tension or arousal that arise from unmet needs.

Pleasure Principle

A psychoanalytic concept suggesting that individuals seek pleasure and avoid pain to satisfy their biological and psychological needs.

Optimal Arousal

A theory suggesting there is a level of arousal that is ideal for facilitating optimal performance on a task or activity.