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.
Earths food chain starts with the sun then it goes to producers such as plants that absorbs the sun’s energy to produce their own “food”
Asexual is just another copy of the same organism. Sexual are two organisms to make another.
Primary eats grass and plants and the secondary eats the primary to get the energy it needs to live
