What is the difference between a heterogeneous mixture and a homogeneous mixture?

Question 4 options:

A heterogeneous mixture is a pure substance and a homogeneous mixture is not.


A heterogeneous mixture has particles that are not uniformly distributed, but a homogeneous mixture has particles that are uniformly distributed.


A homogeneous mixture is a pure substance and a heterogeneous mixture is not.


A homogeneous mixture has particles that are not uniformly distributed, but a heterogeneous mixture has particles that are uniformly distributed.