TASK DEFINITION: Given a scientific question, generate a correct answer to it.
PROBLEM: What fertilizes an egg during sexual reproduction?

SOLUTION: sperm

PROBLEM: In atherosclerosis, thickening of an arterial wall due to this can restrict blood flow through the artery?

SOLUTION: plaque formation

PROBLEM: Differences in fitness among different members of a population can lead to what kind of selection?

SOLUTION:
natural selection