Well, on average 2/3 of a persons weight is water.
So the answer for (a) is basically the enzyme is breaking down the protein (which is the colored part) and this leaves the clear.
For the constants it would be the film and the temperature that the solution is at
For the final question, they could be improved by using more data and multiple trials
Phosphorus moves in a cycle through rocks, water, soil and sediments and organisms.
