All of these are first-line defenses EXCEPT .
a.
saliva
c.
antibodies
b.
cilia
d.
enzymes
ANSWER IS A.

What word is used to describe differences of individual organisms

What are levels of ecology and how can we remember them

Which of the following may one conclude from a map that shows the average ph value of rainfall in the u.s.? acid rain is a more serious problem on the east coast. acid rain falls equivalently across the continental u.s. there are more factories on the west coast. the midwest has fewer forests than the rest of the u.s.