D) It is done with a machine. of a
42. The gravitational potential energy
cucumber-Earth system changes when
which factor changes?
A) the cucumber's speed
B) the cucumber's mass
C) the cucumber's temperature
D) the cucumber's length
132

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation:

answer; lower are;