In the Figure Shown,the Willow Tree Population Leveled Off at 475

question 50

Multiple Choice

In the figure shown,the willow tree population leveled off at 475 trees and remained stable in the early 1980s.This most likely occurred because the

• A)trees occupied all of the available space that willows were able to occupy.
• B)tree seedlings were shaded by the grasses shown in the illustration.
• C)population growth rate exceeded the death rate.
• D)trees depleted all of the nutrients in the soil and the trees could no longer grow.

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Definitions:

Cerebellum

A region of the brain that plays a significant role in motor control, and is also involved in cognitive functions such as attention and language.

Reflex

An automatic and involuntary response to a stimulus, bypassing conscious thought.

Automatic Response

A reaction that occurs without conscious thought, typically as a result of learned behaviors or instincts.

Spinal Cord

a vital part of the central nervous system located within the spine, transmitting nerve signals between the brain and the rest of the body.