Primary reinforcers are effective because a. they satisfy basic biological survival needs. b. we inherently want approval for our actions. c. they have been associated with secondary reinforcers and have become reinforcing. d. the organism has learned to want them.

The answer is A and B: They satisfy basic biological survival needs, and we inherently want approval for our actions.

watching over my siblings so they are safe.

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 .