PLEASE HELP FAST I WILL MARK BRAINLIEST A reactant surface area is increased. There are now:
A. more collisions and greater collision energy
B. more collisions but the same collision energy
C. the same number of collisions and greater collision energy
D. the same number of collisions but the same collision energy

C

Collision theory states that when suitable particles of the reactant hit each other, only a certain amount of collisions result in a perceptible or notable change.

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.

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