The heritable variation among members of a population comes about because of

a. mutation.

b. adaptation.

c. competition.

d. the environment.

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 correct answer is sex-linked recessive.

i just took the test

maybe because its impossible for balloons to lift a whole entire house.

options?

explanation: