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.

a scenario where a cell may be needed to perform a form of endocytosis is when transporting large molecules. a scenario where a cell may be needed to perform a form of exocytosis is when releasing the large molecule from the cell.

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.