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.
D. All of the above are true.
Answer:
Carbohydrates are foods that get converted into glucose, or sugar, in our bodies during digestion. Glucose is a main source of fuel for our body.
Explanation:
Answer:
Iris Diaphragm controls the amount of light reaching the specimen. It is located above the condenser and below the stage. Most high quality microscopes include an Abbe condenser with an iris diaphragm. Combined, they control both the focus and quantity of light applied to the specimen.
Explanation:
