Which of the following adaptations enables deciduous trees to produce more food?
a. thick bark
b. stretching toward the sun
c. leaf loss
d. color change

c. leaf loss

This selection and variation happens more gradually. It is hard to notice over a short period of time. The change is slow, constant and consistent. In punctuated equilibrium, the changes come in spurts. There are periods wherein a huge change occurs and there are also periods with very little change. The mutation is at random. Genetic drift is the change in the frequency of a gene variant due to a random sampling of organisms. 

It's cell theory. easy name i would think.