Describe the biotic and abiotic features of the
tundra.

Biotic factors are those that are living, which includes all of the plants, animals, fungi, protists and bacteria that make their homes there. Abiotic factors are those that are non-living, and these include temperature, pressure, wind, sunlight and weather systems.

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.