A Distinct Substance Composed of Two or More Elements Combined

question 13

Multiple Choice

A distinct substance composed of two or more elements combined chemically in a definite proportion by mass is a

• A)homogeneous mixture.
• B)heterogeneous mixture.
• C)solution.
• D)compound.

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Definitions:

Receptor Sites

Specific locations on the surface of a cell or within a cell where hormones, neurotransmitters, or drugs can bind and elicit a specific physiological response.

Neurons

Nerve cells that are the basic building blocks of the nervous system, responsible for receiving, processing, and transmitting information through electrical and chemical signals.

Billion

A numerical value represented as 1,000,000,000 (in the short scale) or 1,000,000,000,000 (in the long scale, used traditionally in countries like France and Germany).

Human Being

A member of the species Homo sapiens, characterized by a capacity for language, reasoning, and the creation of complex cultures.