What can the sequence of dna tell us about life on earth?

DNA sequences provide a map of the genetic changes because of living species have evolved from common ancestors. By comparing DNA sequences of different organisms, we should be able to reconstruct the evolutionary history of life on Earth.

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.

answer; i believe the correct answer is (data); /// good luck