Which statement best describes the way the paramecium reproduces asexually?
A. It happens by cell division that includes mitosis.
B. It happens by the fertilization of an egg by a
sperm.
C. It happens by the formation of gametes.
D. It happens by cell division that includes meiosis.

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.

you know they are heterozygous for a trait because they have it as jj or jj.