A substance or object in the environment required by an organism for life?

In biology and ecology, a resource is a substance or object in the environment required by an organism for normal growth, maintenance, and reproduction. For plants key resources are light, nutrients, water, and place to grow. ... For animals key resources are food, water, and territory.

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.

in addition to spreading humanist ideas, erasmus has contributed to criticism of corruption in the church.