An exceptionally rainy spring caused many mud slides that covered most of the grass plants and their seeds in soil too deep for successful sprouting. A few seeds were covered in less soil and were able to sprout and reproduce A. Gene Flow
B. Genetic Drift

from the original order (top to bottom) the new order will go

1 (founder)

4 (hawk)

2 (mutate)

3 (next generation)

bc blah

explanation:

bc blah

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.