Match the definitions with their vocabulary terms. Not all terms will be used. a. process in which organisms with extreme expressions of a trait are removed. b. process in which shift of a population toward an extreme version of a beneficial trait. c. process in which individuals with average traits are removed, creating two populations with extreme traits

The answers are Stabilizing selection, directional selection and disruptive selection respectively.

In case of a population of a species, there exists both the homozygous alleles as well as the hybrid of the two characters. This leads to co existence of both hybrids and homozygotes together in a population.

Now because of the natural selection, there remains some characteristics in either homozygotes or in hybrids which gets special advantages over other. So nature selects the preferred race and the number of those individuals in the population increase.

If number of one of the homozygotes increase, then it's the directional selection.

If the number of the hybrids increase, then its Stabilizing selection.

And if both the homozygotes are selected, then it's divergent selection.

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.