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.

The main role of dna in the  cell is the long-term storage of information. it is often compared to a blueprint, since it contains the instructions to construct other components of the  cell, such as  proteins  and rna molecules.the main function of rna is to carry information of amino acid sequence from the genes to where  proteins  are assembled on  ribosomes  in the  cytoplasm. mark brainliest, my work is good.

She should ice it and put ointment on it. thats what my momma does.