Which of the Following Is Not a Mixture

question 21

Multiple Choice

Which of the following is not a mixture?

• A)granite
• B)cake
• C)air
• D)beach sand
• E)None.All of the above choices are mixtures.

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Definitions:

Sponge

A simple aquatic creature with a porous body, or a soft, absorbent material used for washing and cleaning.

Type II Alveolar Cell

is a cell in the alveoli of the lungs that produces surfactant to reduce surface tension and prevent lung collapse.

Surfactant

A substance that reduces surface tension, in the lungs it prevents the collapse of alveoli during exhalation.

Gas Exchange

The biological process through which gases (like oxygen and carbon dioxide) are transferred between the bloodstream and the environment.