I believe it is Wegener's theory did not explain how the continents could move.
I believe the answer is C.
The correct answer is (c) discover antigens in body fluids.
B lymphocytes act as antigen presenting cells that recognizes and displays the antigen to the white blood cells. These cells process the antigens that are present in body fluids. Professional antigen presenting cells includes B-lymphocytes, macrophages, dendritic cells, etc.
Because they’re green. grasshopper are also pretty small.
