In the USA, a particular soybean variety may be adapted to a fairly narrow production zone because Group of answer choices Soybean is very sensitive to temperature Different Rhizobia strains are found in each zone Incidence of diseases varies greatly among production zones Photoperiod strongly influences time of flowering and senescence

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.

the correct answer is primary!