Question

select all the mixtures.
carbon dioxide
pudding
nickel
water vapor

Explanation:

A mixture consists of two or more substances combined physically. Carbon dioxide (\(CO_2\)) is a compound (one - type of molecule: \(CO_2\) molecules). Nickel is an element (only nickel atoms). Water vapor is \(H_2O\) in gaseous state (one - type of molecule: \(H_2O\) molecules). Pudding is made of multiple substances (like milk, sugar, thickeners etc.) combined together without a chemical reaction.

Answer:

Pudding.