A(n) is a carefully regulated procedure in which one or more factors believed to influence the behavior being studied are manipulated while all other factors are held constant.

Experiment

Explanation:

An experiment is a carefully regulated procedure in which one or more factors believed to influence the behavior being studied are manipulated while all other factors are held constant.

It´s also defined as a test that consists in provoking a phenomenon under certain conditions in order to analyze its effects or to verify a hypothesis or a scientific principle.

Through these tests they also determine the qualities and effectiveness of a particular thing of a product.

the correct answer is "hematoma formation, with ligaments that are stretched, partially, of fully torn" ankle sprain are produced by an injury to the tough bands of tissue (ligaments) that surround and connect the bones of the leg to the foot. this causes several damage to the ankle including hematoma formation and ligament injury .