Occurs when there is no net change in concentration and constant
movement of particles.

Cells destroy body cells infected by a virus or bacteria.

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.

In a lab, scientists grew several generations of offspring of a plant using the method shown. what conclusion can you make about the offspring? a. they formed from meiosis and mitosis. b. they have half the number of chromosomes as their parent. c. they have low genetic variability among them. d. they will be able to reproduce only after they grow flowers.