After the swim meet, many cheeseburgers were eaten by a swim team of hungry kids.

Which of these substances does not protect against invaders in the nonspecific immune response? a. saliva b. mucus c. tears d. urine

How does secondary succession differ from primary succession?

Which of the following statements about protists are true? a.they are typically found in moist environments. b.they are all unicellular. c.they have a nucleus. d.they are all multicellular.