Which type of lymphoid tissue has lymphocytes that are loosely aggregated within connective tissue of the mucous membrane of the respiratory and urinary tracts?

The question is incomplete as it does not have the option which are:

Diffuse lymphoid tissue

Explanation:

Lymphatic tissues is the tissue or cells which form the lymph system in the body like the lymph nodes, bone marrow, the white blood cell.

The lymphoid tissues could be highly organized like in the lymph nodes and thymus or loosely organized like in the connective tissues present beneath the epithelial membranes of the respiratory system and gastrointestinal tract.

The lymph cells wander in these spaces and interact with the microbes when they enter and can form nodules like the Peyer's patches and tonsils.

Thus, Diffuse lymphoid tissue is the correct answer.

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.