How can a tree grow to be 90 meters tall using only light water and air

you need to water the tree three times a day and the air is always their so you don't need to worry about the air.

it would be the percentage of food eaten by the flock

i remember doing this lab

affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.