Question

humans absorb oxygen from the air they breathe in and exhale carbon dioxide gas. carbon dioxide gas is a compound of carbon and oxygen atoms. a mixture of carbon and oxygen atoms a solution made of carbon and oxygen atoms. an element made of carbon and oxygen atoms.

Explanation:

To determine the correct option, we analyze the nature of carbon dioxide ($\ce{CO_2}$). A compound is a substance formed when two or more elements are chemically bonded together. Carbon dioxide consists of carbon (C) and oxygen (O) atoms chemically combined in a fixed ratio (1:2). A mixture is a combination of substances without chemical bonding, a solution is a type of mixture (usually liquid with dissolved solute), and an element is a pure substance with only one type of atom. So $\ce{CO_2}$ is a compound of carbon and oxygen atoms.

Answer:

A. a compound of carbon and oxygen atoms