branching worm living inside a sponge
... that the branching worm living inside a sponge is unlikely to be able to sustain itself solely through what it eats?
... that the <b id="mwBFk"><a href="./Ramisyllis_multicaudata" id="mwBFo" rel="mw:WikiLink" title="Ramisyllis multicaudata">branching worm living inside a sponge</a></b> is unlikely to be able to sustain itself solely through what it eats?