The structure of a plant's leaf best supports the process of gas exchange for photosynthesis
water absorption for transpiration
water absorption for cellular respiration
energy absorption for cellular reproduction

answer; ///i believe the answer your looking for is (ribosomes);

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.

the answer for this question would be d. glaciers