The Next Few Questions Refer to the Following Evolutionary Tree

question 29

Multiple Choice

The next few questions refer to the following evolutionary tree, whose horizontal axis represents time (present time is on the far right) and whose vertical axis represents morphological change.

-Which of these five species is the extant (i.e., not extinct) species that is most closely related to species X, and why is this so?

• A) V; shared a common ancestor with X most recently
• B) W; shared a common ancestor with X most recently
• C) Y; arose in the same fashion (i.e., at the same tempo) as X
• D) Z; shared a common ancestor with X most recently, and arose in the same fashion as X
• E) This tree does not provide enough information to answer this question.

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Definitions:

Aphasia

A neurological condition characterized by the loss or impairment of the ability to communicate, either through speech, writing, or understanding language.

Temporal And Frontal Lobes

Brain regions with roles in processing auditory information, memory (temporal), and decision making, speech, and problem solving (frontal).

Difficulties Speaking

Challenges or impairments in the ability to produce speech sounds correctly or fluently, often due to developmental, neurological, or physical reasons.

Limbic System

A complex system of nerves and networks in the brain, involving several areas near the edge of the cortex concerned with instinct and mood. It controls basic emotions and drives.