Genetic drift is one mechanism of evolutionary change. Which of the following best describes an example of genetic drift?

A.
A small population of frogs, which used to be brown and green, is now all green due to chance.
B.
Gazelles, which are preyed on by cheetahs, have gotten faster and more agile over time.
C.
The genetic variation between two populations of gorillas decreases due to interbreeding.
D.
Over time, birds acquired stronger beaks by opening and eating tougher nuts and seeds.

Azoologist is studying four very closely related feline species. she wishes to compare their gestation periods. an observational study is conducted where the zoologist observes the gestation period of 50 randomly selected felines in each species. a one-way anova test is run to test the hypothesis that the average gestation period is the same for each of the four species. a level of significance of 0.05 is used, and a p-value of 0.01 is calculated. based on this result, the conclusion that can be drawn is that: