Ancestors of Giraffes with Shorter Necks Could Not Reach Branches

question 45

Multiple Choice

Ancestors of giraffes with shorter necks could not reach branches high up in trees for food.This led to ____ for longer necked giraffes.

• A)Stabilizing selection
• B)Disruptive selection
• C)Artificial selection
• D)Sexual selection
• E)Directional selection

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Definitions:

Positive Reinforcer

A stimulus which, when presented after a behavior, increases the likelihood of that behavior being repeated.

Negative Reinforcer

An aversive event that, when removed after a behavior, increases the likelihood of that behavior being repeated in the future.

Positive Reinforcer

A stimulus that, when introduced after a behavior, increases the likelihood of that behavior being repeated.

Negatively Reinforced

A process in operant conditioning where a response or behavior is strengthened by stopping, removing, or avoiding a negative outcome or aversive stimulus.