The correct answers are:
Tissue level- similar cells work together to accomplish a goal.
Examples of tissue are muscles, skin, bone, and brain (nervous tissue).
A sponge is an example of an organism that is only organized to the cellular level.
I think that that the answer should be C asexual reproduction of a single-celled organism
deforestation- making room for new buildings by clearing trees and forests
pollution- from factories, litter, and bad hygiene
