Afew members of a population are immune to a disease that kills many others.
they survive and reproduce. what is this an example of?

a) survival of fit individuals.

b) overproduction.

c) none of the above.

d) variation.

The model illustrates a process by which a substance is taken up by a cell

The circles, or orbits, for electrons are called energy levels. each level can hold only a certain number of electrons. add electrons to each level until you can't add any more. how many electrons can each level hold?

The nervous system interacts with the endocrine system by a. using hormones as connections b. sending nerve impulses directly to glands c. using neuroendocrine cells as connections d. sending neurotransmitters directly to neurons