Answer:
Metabolic wastes or excretements are substances left over from metabolic processes (such as cellular respiration) which cannot be used by the organism (they are surplus or toxic), and must therefore be excreted.
This is what i found out i hope this is a good enough answer!! :P
There is nothing to choose from?
My greatest fear would have to be getting stuck in an elevator.
Lay your head back and put a wet towel across your nose are we friends
