Question

keenan is a sprinter on his schools track team. during a race, his breathing rate increases until it is much higher than his resting breathing rate. his breathing rate remains elevated until the race is over. once the race is finished, keenans breathing rate gradually returns to normal.
which graph could show keenans breathing rate during and after a race?

Explanation:

Step1: Analyze the breathing rate pattern

During the race, Keenan's breathing rate increases until it's higher than resting, then remains elevated until the race ends, and then gradually returns to normal. So the graph should have a phase where the breathing rate is constant (while the race is ongoing) after the initial increase, then a decrease.

Step2: Compare the two graphs

The first graph has a period of constant breathing rate (horizontal line) after the initial increase, then a decrease. The second graph has the breathing rate decreasing immediately after the initial increase, which doesn't match the description (since it should remain elevated during the race).

Answer:

The first graph (the one with a horizontal segment during the race period)