The Hormone Prolactin, Found in Distantly Related Vertebrates, Exerts Different

question 51

Multiple Choice

The hormone prolactin, found in distantly related vertebrates, exerts different effects in different species. From an evolutionary standpoint, this is an indication that prolactin

• A) can only have functions related to childbirth.
• B) is an ancient hormone whose function diversified through evolution.
• C) was a recent evolutionary adaptation.
• D) was not required in fish and amphibians.

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Definitions:

Contingent

Dependent on or conditioned by something else; not absolute or certain.

Pleasant Event

An occurrence or activity that brings joy, satisfaction, or positive feelings to an individual.

Unpleasant Event

An occurrence that is not enjoyable or satisfying, often causing discomfort or distress.

Primary Reinforcer

A naturally reinforcing item or factor, such as food or water, that does not require learning to be effective in increasing the likelihood of a response.