What is the number one cause of death in children ages 1 to 15 in the United States?

An infant's immune system has the theoretical capacity to respond to about 10,000 vaccines at one time.

a. true b. false

What are the most important substances transported into the tubules by means of secretion?

a. H+ and K+ c. Na+ and K+ b. H+ and Na+ d. glucose and water