Which characterization accurately describes BOTH regular fossils and index fossils? (A) Both kinds of fossils are found only on the floor of the ocean.
(B)
Both kinds of fossils are used to define periods in geologic time.
(C)
Both kinds of fossils are distinctive and widespread.
(D)
Both kinds of fossils have information about the time period they came from.

D

Explanation:

Fossils tell us where they came from.

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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.