What is measurement? Write any two importance of measurement.​

The Process of comparison of an unknown quantity with a known standard quantity is known as measurement.Any two important of measurement are:

1) Measurement helps in selling and buying goods.

2)it helps to obtain the accurate results about physical quantities.

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.