Which of the following represents a parasitic relationship? tick on a dog lion eating a zebra bees pollinating flowers two frogs mating

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)

the correct answer is:

a population changes in response to a change in the environment.