This occurs because earthworms reduce the amount of substrate available to other decomposers, and because earthworms ingest other decomposer organisms as they feed.
(This; occurs; ) (earthworms; reduce; the amount of substrate available to other decomposers) (earthworms; ingest; other decomposer organisms) (they; feed; )
This earthworms earthworms they
occurs reduce ingest feed
the amount of substrate available to other decomposers
other decomposer organisms