Which do the green tanks represent in the picture below?
a. vaccines b. pathogens c. antibodies d. antigens

The right answer is C.

An antibody is a complex glycoprotein used by the immune system to specifically detect and neutralize pathogens. The antibodies are secreted by cells derived from B lymphocytes: the plasma cells.

So if we want to shematize the immune reaction, the tanks represent the plasma cells and the canons represent the antibodies.

On edge.nuity the answer is C- Antibodies

stress fractures occur largely in the feet and legs and are common in sports that require repetitive impact, primarily running/jumping sports such as gymnastics or track and field.

"a.) well–developed vascular system."