Mara adds 4 tablespoons of water to the sand, 7 tablespoons to the gravel, and 5 tablespoons to the soil. Calculate the porosity of each of Mara's samples using this formula, and record the results in the chart. % porosity = (amount of water added to sample ÷ total sample volume) × 100

“Total sample volume” is the amount of soil, sand, or gravel. A half cup is equal to 8 tablespoons.

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hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.

air enters through the nose, moves through the nasal cavity, the pharynx, the larynx, enters the trachea, moves through the bronchi andbronchioles till the alveoli.