The answer is
<span>Aquifers are underground layers of rocks which contain water and serve as important sources of freshwater. They are located below the water table and in the saturated zone. If an aquifer becomes trapped between two impermeable layer (for example, one below and one above that overlies the aquifer), the pressure act on the aquifer and it can become a confined aquifer.</span>
Answer:
a measurement is a number that shows the size or amount of something. Usually the number is in reference to some standard measurement, such as a meter or kilogram.
Answer:
protiens: amino acids
lipids: fatty acid and glycerol
carbohydrates: monosaccharides
nucleic acid: nucleotides
Explanation:
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.
