I would say, trunk flexion uses the most amount flexibility.
Coal mining causes massive land use, tailings (waste), pollution to the air and water, and the effects it can have on the workers mainly includes respiratory problems.
Some things that could happen to prevent pollution is to keep the area as contained as possible away from water outlets. Safer, environmentally friendly chemicals could be used instead of chemicals that pollute the air and water. Mining waste needs to also be properly disposed of and away from any water is could seep into.
Tumors is the correct answer
