Which two statements describe force? A. Force causes an object's motion to remain constant.
B. A force can have mass or weight.
C. Force is the ability to change an object's motion.
D. A force can be a push or a pull.

What will happen to a population of predators if there is a sudden, temporary increase in the number of prey? a. the population of predators will be uniform with no change. b. the population of predators will increase first and then decrease slowly. c. the population of predators will increase continuously.

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm

Facilitated diffusion move large molecules and/or polar molecules across the cell membrane. what does facilitated diffusion use to do this?