The Wing of a Penguin and the Wing of an Eagle

question 24

Multiple Choice

The wing of a penguin and the wing of an eagle are

• A) homologous structures.
• B) analogous structures.
• C) identical structures.
• D) vestigial structures.
• E) not comparable in any way. The forelimbs of all vertebrates are homologous since they are inherited from a common ancestor, regardless of the superficial appearance of the structures.

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Definitions:

Dendrites

Extensions of neurons that receive signals from other neurons and transmit them toward the cell body.

Axon

A long, slender projection of a nerve cell, or neuron, that conducts electrical impulses away from the neuron's cell body to transmit information to different neurons, muscles, and glands.

Reticular Formation

A complex network of interconnected neurons that are involved in regulating wakefulness, sleep, and transition between sleep and wakefulness, as well as in various reflex actions.

Limbic System

A complex system of nerves and networks in the brain, controlling basic emotions and drives like fear, pleasure, and anger.