Answer:
It affects populations, It occurs when there is genetic variation, It selects organisms with certain traits to survive. I'm not 100% sure this is completely correct, but I just studied this in school and this sounds right. :)
Answer
Option C - Skeletal Muscles
Explanation
Antagonistic pairs are the muscles that are functionally opposite, if one produces flexion, then the other's primary action is an extension. Skeletal muscles work in pairs to move a bone so that the muscles can function properly. They contract the bone making nerves deliver a message to the brain. For example. Biceps and triceps. The lower arm is moved upwards when the biceps muscle contracts and the triceps muscle is relaxed and vice versa.
