A tissue is composed of a group of

Tissue is a group of cells that have similar structure and that function together as a unit. primary types of body tissues include epithelial, connective, muscular and nervous tissues. Epithelial tissues form the covering of all body surfaces , ine body, cavities and hollow organs, and are the major tissues in glands.

it enhances antibody production by t cells of the adaptive immune system.

hope i'm right

explanation:

for a different answer set the answer would be because the oxygen in the water had depleted (apex)