Structures as Different as Human Arms, Bat Wings, and Dolphin

question 1

Multiple Choice

Structures as different as human arms, bat wings, and dolphin flippers contain many of the same bones, these bones having developed from very similar embryonic tissues. How do biologists interpret these similarities?

• A)By identifying the bones as being homologous
• B)By the principle of convergent evolution
• C)By proposing that humans, bats, and dolphins share a common ancestor
• D)A and C only
• E)A, B, and C

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Definitions:

Conscious Motivation

The awareness of internal or external forces that stimulate the desire to commit to a particular course of action.

Core Region

Typically refers to the central, most important area of a body or structure that often plays a crucial role in its function.

Quasi-Need Reduction

The concept that certain actions may temporarily reduce the strength of a need without it being completely satisfied.

Psychological Environment

The subjective perception of one's surroundings that can significantly influence mental and emotional states.