1-2 = -1 if im right someone answer my other question

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

What does polymerase chain reaction (pcr) do? o a. separates dna fragments by size o b. cuts a dna sample into fragments o c. provides an overall picture of a person's chromosomes o d. makes more copies of a sample of dna

In the ocean why are the greatest amount of primary producers found in the epipelagic zone and how does that affect biodiversity