Which Statement Is TRUE with Regard to the Duration of a Self-Generated

question 21

Multiple Choice

Which statement is TRUE with regard to the duration of a self-generated sleep/activity cycle?​

• A)It is unreliable in most species, and dependably close to 24 hours only in primates.
• B)​It is longer if the organism is normally active in the dark.
• C)​It rarely varies from one individual to another, if at all.
• D)It is highly consistent in a given individual in a given environment.

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Definitions:

Esophagus

A muscular tube connecting the throat (pharynx) with the stomach; food is pushed through it by peristaltic movements.

Salivary Amylase

An enzyme found in saliva that starts the process of starch digestion in the mouth.

Nutrient

Substance that an organism must acquire from the environment for growth and survival.

Cecum

A pouch connected to the junction of the small and large intestines which plays a role in absorbing fluids and salts that remain after intestinal digestion.