Aboxer can punch a heavy bag for more than an hour without tiring, but will tire quickly when boxing with an opponent for a few minutes. why? (hint: when the boxer's fist is aimed at the bag, what supplies the impulse to stop the punches? when the boxer's fist is aimed at the opponent, what or who supplies the impulse to stop the punches that don't connect? )

Different plant and animal species have a great variety of body structures that them survive and reproduce. which of the following is also true? a. the individual cells of plants and animals cannot perform specialized functions. b. the individual cells of plants and animals function in very similar ways. c. the individual cells of plants and animals do not share any similarities. d. the individual cells of plants and animals do not contain genetic information. reset submit