An enzyme. An enzyme is a protein speed up a biochemical reaction. It’s a catalyst.
Hope this helps :)
I belive that the emperor penguin fits all the criteria of Group B.
Multi-cellular Heterotrophs
Animals have more than one cell and can't produce their own food
I do not believe it is possible for long periods of time. If the intestines are still intact, one can live for up to a certain period of time without medical help. However, this is an extremely short period of time.
