Question

question 4 of 10
which causes natural selection to occur?
a. a lack of competition
b. unlimited resources
c. populations below the carrying capacity
d. the presence of predators

Explanation:

Natural selection occurs due to environmental pressures. Predators create such pressures. A lack of competition (A) and unlimited resources (B) reduce selection pressures. Populations below carrying capacity (C) also don't drive selection as strongly. Predators (D) force organisms to adapt, thus causing natural selection.

Answer:

D. The presence of predators