either, both, all; such that, such as, so that Pollution is caused ______by man's release of completely new and often artificial substances into the environment, or by releasing greatly increased amounts of a natural substance. ______oil from tanker i
either, both, all; such that, such as, so that Pollution is caused ______by man's release of completely new and often artificial substances into the environment, or by releasing greatly increased amounts of a natural substance. ______oil from tanker into the sea.
