Answer:
"pumps blood against a greater resistance" that the answers. hope this helped
I no it will be right because I took the quiz I no it is right it is A
Pick b just pick b I know its right I have hade the same one
Answer:
Mechanical barriers — which include the skin , mucous membranes , and fluids such as tears and urine — physically block pathogens from entering the body. Chemical barriers — such as enzymes in sweat , saliva , and semen — kill pathogens on body surfaces.
