Two closely related species such as chimpanzees and gorillas have different traits because they:
a. have a different genes.
b. look slightly different.
c. have different kinds of dna.
d. have different parents.

I'm not positive but I believe it is C. It definitely isn't A or D. C would include that they have different genes because of the different DNA's.

Explanation:

i think it would be b. tissue because an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

answer; cnidarians;