Which of the following is a true statement? O Soil tests are most useful during the growing season to monitor plant nutrient uptake.
O Plant tissue analysis is the best assessment of nutrient levels in soil.
O Using a soil test and plant tissue analysis in combination will provide the best results for nutrient availability and the best corrective action.
O Soil tests are most useful during the growing season to predict lime and fertilizer needs.

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.

sorry, but you do not have posted the diagram.

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.