Which of the following is true of antibodies?
A. Antibodies are proteins.
B. Antibodies are specific to pathogens.
C. Antibodies are produced by the immune system.
D. All of these are true.
Which of the following is true of antibodies?
A. Antibodies are proteins.
B. Antibodies are specific to pathogens.
C. Antibodies are produced by the immune system.
D. All of these are true.