What information did you include in your response? Multiple Choice A. Crossing over is the process by which genetic material is exchanged by non-sister chromatids during meiosis.

B. Crossing over results in a new combination of genetic information for the cell for a specific trait.

C. Crossing over ensures that organisms are not identical from generation to generation.
D. Genetic recombination allows for a variation in genetic material that is passed through the generations.

Only you can answer this unless the last response is given.

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.