What would happen if we had no system of lymphatic vessels, and tissue fluid was moved directly back into the circulatory system throughout the body.

No adaptive immune responses would occur during pathogen attack

Explanation:

The lymphatic vessels are required in the migration of dendritic cells and to transport antigens from the interstitium of peripheral tissues to the lymph nodes, in which the T cells are activated to become effector cells. Moreover, the T (and B) effector cells move through lymph vessels to encounter those antigens presented by dendritic cells. In consequence, the lymphatic vessels have critical functions during adaptive (acquired) immune responses.

answer; ///i do believe the answer is (virus);

as in mitosis, dna replication occurs during interphase.   in meiosis, it occurs specifically in s phase of interphase 1.