Why is living things important in a ecosestem?

First of all, all living things play a yery important job in each habitat or place. It is either an animal eats to help balance a population of a species, decomposes dead carcasses and bodies into the soil below, helps feed itself to another animal by just being there, or an animal helps another animal, but not by simply eating, for example: a bee moves pollen to help grow more flowers.