Symbiotic relationships are when usually two organisms depend on each other for survival. If you remove one, the other will die. An example of this is rainforest trees such as Ceiba trees and fungi. The trees need the fungi to protect their roots from parasites and the fungi needs the tree to release nutrients into the soil when leaves and fruit drop to the forest floor. People don't understand that once you cut down a section of rainforest, that section will never grow back again. If rainforest get destroyed, they will not appear again.
Planting tress back doesn't work due to the symbiotic relationship being permanently broken.
Thanks for accepting this open challenge and good luck to all!