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21. In the case of humans, list the three main technological advancements that contribute to possible overpopulation.

Advances in agricultural technology have allowed efficient production of crops and other foods. As a result, the human population has begun to grow faster. Medical advances have also allowed the human population to increase.

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i think it's c

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.