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.
Answer:
Tbh they come from the Male sperm and the Female egg. Once the sperm fertilizes the egg then you have a baby! That's the short and simplified answer
Explanation:
Answer:
producers
Explanation:
producers are plant which are at the base of an ecosystem.
Answer:
Ecosystem health indicators are measures which help us to understand where action should be taken to restore ecosystem health and associated benefits.
Explanation: