In a large scale study of older adults in the United Kingdom, it was found that all of the following behaviors, EXCEPT lead to an increased life span of 14 years.
OA) perfectionistic
B) nonsmoking
C) regular exercise
D) moderate alcohol consumption

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.

geologic time scale (for gradpoint) =)