Question

a macromolecule made of carbon, hydrogen, and oxygen that cells use for energy
○ carbohydrate
○ catalyst
○ cell
○ cell cycle

Explanation:

Carbohydrates are macromolecules composed of carbon, hydrogen, and oxygen, and cells use them for energy. A catalyst speeds up reactions, a cell is the basic unit of life, and the cell cycle is cell division process—none match the description.

Answer:

A. carbohydrate