What defines a mixture?
a. a mixture cannot be broken down into simpler substances.
b. a mixture can be broken down into its basic substances through physical means.
c. a mixture is created through a chemical reaction.
d. a mixture can be described by a chemical formula.?

b.a mixture can be broken down into its basic substances through physical means.

Explanation:

The substances in a mixture can be separated using physical methods such as filtration, freezing, and distillation. There is little or no energy change when a mixture forms. Mixtures have variable compositions, while compounds have a fixed, definite formula.

2b2t

explanation:

2b2t