Question

question 6 of 10
which two sentences describe examples of natural selection?
a. a population of guppies become smaller and faster after a
predator is introduced to its creek.
b. a rose bush bred by humans does not have any thorns on its
stems.
c. a bird becomes lost during migration and joins a new, unrelated
flock.
d. dark - colored fur becomes more common in a mouse population
after a volcanic eruption.

Explanation:

Natural selection is the process where organisms better adapted to their environment tend to survive and reproduce. In option A, the guppies that are smaller and faster (better adapted to avoid the predator) are selected. In option D, after the volcanic eruption (a change in the environment), dark - colored fur (which may help in camouflage in the new, darker - colored environment) is selected. Option B is artificial selection (done by humans). Option C is about migration and joining a new flock, not about selection based on environmental adaptation.

Answer:

A. A population of guppies become smaller and faster after a predator is introduced to its creek.
D. Dark - colored fur becomes more common in a mouse population after a volcanic eruption.