What is the basic unit of matter?

A. atom

B. electron

C. cell

D. energy

Answer: A

Explanation: An atom is the basic unit of matter. The atom is the basic building block of an element, and cannot be broken down further using any chemical means. An atom is made up of three particles: protons, neutrons and electrons.

Answer:Your answer is A) an Atom

Explanation: Atoms are the basic unit of matter because it cannot be broken down to another substance.