Molecules that are recognized by the immune system as potential pathogens are called:
a. antigens.
b. antibodies.
c. histamines.
d. microbes.
Question 2
Types of polymorphonuclear leukocytes include:
a. T lymphocytes.
b. B lymphocytes.
c. natural killer cells.
d. immunoglobulins.
e. basophils.