Sharks of the Cenozoic were largely filter feeders, despite their intimidating teeth! Platybeldon had very large narrow lower tusks that were used for fighting sharks. Megaldon sharks could technically eat mastodons. Shark jaws were huge, disproprotionately so, compared to their bodies.

white blood cells or wbc s are mainly 2 types-

1.agranulocytes

2.granulocytes

the monocytes or macrophages of agranulocytes , dendritic cells which are accessory leucocytes, and b cells which is one type of lymphocytes   identify the antigens present on the pathogen's surface. these three cells are called antigen presenting cells(apc) which are phagocytes and destroy the antigens by secreting antitoxins. besides this leukocyte is always plays vital role in the immunity of the body.

thinking it would be d not too sure but i think it's right