The Most Abundant Form of Matter in the Universe Appears

question 32

Multiple Choice

The most abundant form of matter in the universe appears to be:

• A) water molecules.
• B) planets and planet-like bodies.
• C) dust and debris.
• D) hydrogen.

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Definitions:

Leptin

A hormone produced by fat cells that helps regulate body weight by signaling the brain to reduce appetite and burn more calories.

Estrogen

A group of steroid hormones that promote the development and maintenance of female characteristics of the body.

Cortisol

A steroid hormone produced by the adrenal glands, often released in response to stress and low blood-glucose concentration.

Lipid

A group of naturally occurring molecules that include fats, waxes, sterols, fat-soluble vitamins (such as vitamins A, D, E, and K), monoglycerides, diglycerides, triglycerides, and phospholipids.