Mucosae of a healthy intestinal tract (select all that apply.)
a. have a large number of activated t and b cells
b. harbor t cells bearing a very wide diversity of antigen specificities
c. contain intraepithelial lymphocytes
d. have large numbers of resident neutrophils
e. are populated with both α: β and γ: δ effector t cells.

Option (A), (C) and (D).

Explanation:

A mucosa is the membrane that mainly lines the body cavities and covers the internal surface organ of the body. The mucosa is present in the whole intestinal tract.

This mucosa plays an important role in the immunity of the organisms. The mucosa contains both the B cells and T cells that plays an important role in humoral immunity and cell mediated immunity. The neutrophils plays an important role in the inflammation and also phagocytose the cell.

Thus, the correct answer is option (A), (C) and (D).

the correct answer: the index of refraction of the second medium is lower i tried this persons answer and it was wrong this person is lying

trachea, alveoli, lung capillaries, arteries