Agroup of students obtained the following data while trying to determine the effect of exercise on pulse rate.

what is the independent variable?

question 5 options:

a. exercise

b. number of students

c. pulse rate

d. beats per minute

Polar bears give birth and hunt on sea ice. which of the following would polar bears survive during the melting of arctic ice? growing another layer of fur during summer migrate inland to search for different food sources staying put until the ice refreezes sticking to the usual diet of seals