Which statement best explains why herbivores are not considered parasites? a. they do not harm the plants they eat. b. they do not live on or in the body of a host. c. they do not depend on the plants they eat for survival. d. they do not actively hunt other species for food.

Sunita will change the variable water.

Explanation:

Sunita have to change the variable water to perform this experiment of diffusion.This is because she is going to predict that more water she uses longer the time needed for the dye to spread through it.

 As a result she is increasing the amount of water to observe the effect of diffusible substance on diffusion with time.