Which human body process offers a clear example of positive feedback? blood pressure regulation

body temperature control

insulin controlling blood sugar

blood clotting caused by thrombin

blood clothing

Explanation:

the thrombin is cloting it

it would be c. xylem.

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.