Research investigations in which neither the research subject nor the data collectors are aware of who is in the control group and who is in the experimental group are known as .

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 .

good question. i'll be looking into that. (this is a joke sir)

answer; consonant;