Absorption is defined as which of the following?

• A. Taking in substance into body of another
• B. Binding to a surface
• C. Circulating air through a liquid
• D. Growth of bacteria

Answer: (A)

Absorption is the process of a substance entering the interior of a body or cell. It involves uptake from a surface into the internal environment, enabling the substance to be used or processed inside. This is why taking in a substance into the body of another fits the definition.

The other descriptions represent different processes. Binding to a surface describes adsorption, where substances adhere to a surface but don’t enter the interior. Circulating air through a liquid is aeration, which mixes or oxygenates but doesn't involve inward uptake. Growth of bacteria is replication, not absorption.