Charlie hypothesizes that if he adds earthworms to a compost pile, it will decompose lwice as fast as a compost pile without
garthworms which of the following steps could compromise his experiment?
1 start iwo compost piles at the same time with the same materials
2. add earthworms to one compost pile
3. add decomposing bactena to the other compost pile
4 rate the level of decomposition in each compost pile every week
5 report his results