Which is a cost that comes with using coal as an energy source?
coal produces less energy than most other energy resources,
mining coal improves the environment.
coal will stay plentiful in the united states.
when burned, coal produces pollutants that are released into the air.

16 select the correct answer from each drop-down menu. sharks, whales, and dolphins share similar features such as body shape and the position of fins. hoy while whales and dolphins have lungs. these differences indicate that the organisms share a comme whales also possess a vestigial pelvic bone. the presence of the pelvis bone may indicate that whales reset next