The answers are stress accumulations and reoccurrence! I hope this helped you and I hope you have a great day! :)
V (volume) = 5l
c (molar concentration or molarity) = 3 M = 1 mol/l
c = n/V, where n is the number of moles or amount of substance
So: n = c * V = 3 mol/l * 5l = 15 moles
The last one
some cells are living and some cells are not
i think
The entire food web would be affected