This is a model to students understand the process of photosynthesis, which allows plants to create their own food. the greatest limitation of this model is that a) the roots are visible in the model. b) the cellular structure of the plant is not included. c) the comparative size of the plant and the sun are inaccurate. d) it is incomplete and does not show all reactants and products.

The answer is D. It is incomplete and did not show all reactants and products.

~Alahna Wigfall

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.