The respiratory system is part of the excretory system because it A
disposes of bodily wastes.
B
excretes liquid waste dioxide.
с
excretes sweat through the skin.
D
involves the kidneys.

B excretes liquid waste dioxide.

the more fit you are, the faster the recovery. your heart rate drops most sharply in the first minute after you stop exercising; it should then fall about 20 beats a minute—a drop of less than 12 beats a minute is considered abnormal. this “recovery heart rate” is measured as part of an exercise stress test.

answer; (d) braking faster then cars;