Tears, saliva, and vaginal secretions are rich in and other proteins that break down and destroy many microorganisms.

a. histamines
b. enzymes
c. macrophages
d. lymphocytes

The correct answer is B. enzymes

Explanation:

Enzymes are made up of proteins and they are important to the body to perform metabolic activities. Some enzymes play an important role in providing non-specific defense to the body for example lysozyme.

Lysozyme is present in saliva and tears which protect us from bacterial infection. It acts on the peptidoglycan cell wall of bacteria and kill bacteria by destroying their cell wall. Vagina contains lactobacillus species that produce acids and decrease the pH of the vagina which resists most bacteria to grow.

It also have secretory glycoproteins(antibodies) like IgA and IgG which protect the vaginal tissue from invading microbes.

you know they are heterozygous for a trait because they have it as jj or jj.