As humans grow, their bodies change. Which of these statements explains how humans grow? A. cells from a cell wall
B. cells undergo mitosis
C. cells increase in size
D. cells merge to become larger

B. cells undergo mitosis

Explanation:

Many organisms increase in size over time. However, it is not because the cells are increasing in size. It is because of mitosis, in which the cell are multiplying in amount, or increasing in number.

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.

not only is it colder, it also becomes darker, less salty, and more dense.