Which of the following is not a variable that influences blood flow and blood pressure?

A) Blood type

Explanation:

Do Process Elimination

Viscosity is how thick it is

Volume is how the form of it is in the circulatory system

Vessel diameters is the size of the Blood Vessels

So that leaves A.

i think the miocene epoch spans the time from 23 million to 12 million years ago.

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.