Natural selection in action Steps:

• Green insects are camouflaged, making them less visible to birds.
• Birds preferentially eat visible red insects, reducing their population.
• Green insect population increases as they survive and reproduce more.
• Over time, the graph shows a shift favoring the better-adapted green variant.

Why D is correct:

• This demonstrates natural selection, where environmental pressures (bird predation) favor individuals with advantageous traits (camouflage), leading to population changes as defined by Darwin's theory.

Why the others are wrong:

• A: Continuous variation involves a range of phenotypes, not discrete colors like red or green.
• B: Incomplete dominance produces blended traits in offspring, unrelated to survival-based population shifts.
• C: Natural selection is the process, but D specifies the example type (assuming D is the precise term like "directional selection").

Final answer: D