Can someone help me?

Which word in the sentence below is an interrogative pronoun? who is picking us up from school? whousisfrom

Hormones perform important functions within the reproductive system. during puberty, a number of changes occur in the body. which hormone is responsible for the development of these characteristics in the female? estrogen progestin progesterone testosterone

Eric drove 275 miles in 5 hours. at the same rate how long would it take him to drive 495 miles?