Dolphins Are Able to Sleep Without Drowning Because They

question 638

Multiple Choice

Dolphins are able to sleep without drowning because they

• A)have gills, like fish do.
• B)have a special opening that allows air in but not water.
• C)sleep on just one side of their brain at a time.
• D)inflate their bodies before sleep, which maintains them floating upright so they can breathe without taking in any water.

---

Definitions:

Metabolic Rate

The rate at which an organism converts food and oxygen into energy and waste products, influencing its speed of growth, reproduction, and aging.

Thyroid Hormone

A hormone produced by the thyroid gland that regulates metabolism, energy generation, and growth and development.

Glucose Storage

The process by which glucose is stored in the body, primarily in the liver and muscles, in the form of glycogen for later use as energy.

Melatonin

A hormone that regulates sleep and wakefulness, produced by the pineal gland in the brain.