Why is tall grass prairie north america's rarest biome? historically it only occurred in a very tiny region of north america. because over 90% of this biome has been converted to agriculture. global warming has resulted in the conversion of most tall grass prairie to short grass prairie. pollution has degraded most of our tall grass prairie region?

hello there,

guys i’m confused.

which rock will weather faster?

answer: b rock

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.