The fossil record shows that an organism is relatively unchanged for a long period of time, followed by several changes over a short period of time, followed by another period of stability. this provides evidence for which view of evolution?

a. biotic potential
b. monophyletic development
c. graduated speciation
d. punctuated equilibrium

D. punctuated equilibrium

Explanation:

Punctuated equilibrium refers to the process of evolution which includes two long periods of little or no change in the gene pool of population. These periods of stability are disturbed by a short active phase of rapid changes in the gene pool and appearance of adaptations in individuals of population. Hence, the organism showing two prolonged periods of stability in terms of evolution punctuated by short phase of changes represents punctuated equilibrium.

The correct answer is option D. "punctuated equilibrium".

Explanation:

Punctuated equilibrium is an evolutionary theory that states that a species stays in a long period of time without suffering any substancial change called "statis", followed by a short and rare period of dramatic changes called cladogenesis. Punctuated equilibrium states that evolutionary changes occur quickly and in separated periods of time. This theory of evolution contrast the theory of phyletic gradualism, which states that evolution occurs constantly and uniformly by gradual transformations.

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.

oak trees? ? what was listed