The contractile vacuole is responsible for maintaining the water balance in many protists, like the euglena above. maintaining this water balance is an example of
a. equilibrium.
b. homeostasis.
c. active transport.
d. passive transport.

3. in the fruit fly, recessive mutation brown, b, causes brown color of the eye and absence of red pigment. recessive mutation p of another independent gene causes purple color of the eye and absence of brown pigment. the cross of a brown-eyed female and purple-eyed male produced wild type eyes. what will be the colors and their ratio in f2?