Question

part of the immune systems job is to remember the lymph sent through the lymphatic system. the b cells produced by antibodies. the coordinated actions of t cells. the antigens it has dealt with in the past

Explanation:

The immune system has memory cells (like memory B and T cells) that "remember" antigens (foreign substances) they've encountered before. This allows for a faster and more effective response upon re - exposure. Lymph is a fluid, B cells produce antibodies (not the other way around), and while T cells are important in immune responses, the key aspect of "remembering" is related to antigens.

Answer:

the antigens it has dealt with in the past