I tried to make the topic interesting Please Register or Log in to view the hidden image! I hear that rotting human flesh smells much worse than rotting animal flesh. Is there any truth to this? Why is that? I also hear stories of human feces killing plants (such as grass). What causes human feces to kill grass, while manure replenishes it? Just a 'Intro to Biology' college student here, be nice Please Register or Log in to view the hidden image!