Which type of species are generally able to have a greater carrying capacity in an ecosystem because of the fact they occupy a broad niche?

 Generalist species are capable  to survive in different environmental conditions and they are able to utilize various resources for example, a heterotroph with a varied diet. On the other hand specialist species can thrive only in few range of environmental conditions or has a limited diet. Most of the organisms do not come into either group.

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.