The Gardener by S.A Bodeen
I thought it was going to about trees and plants.
evolution has to do with the gardener because they are making a different human race.
Autotroph has to do with the gardener because the kids are Autotroph and they are a diffirent race.
Heterotroph has to do with the gardener because the kids in the story get there energy from the sun.
photosynthesis is important to the story because the kids use photosynthesis to survive.