Humans are part of the environment — not separate from it — so anything that benefits human welfare is by definition an environmental improvement!
The one that says "<span>A tapeworm lives inside the intestines of a pig, robbing the pig of nutrients it needs."</span>
the part of the alimentary canal that connects the throat to the stomach; the gullet. In humans and other vertebrates it is a muscular tube lined with mucous membrane. hope that helps <3 Jacoby