The worm-like creatures burrowed beneath the biomat, eating its decaying underside and breathing the oxygen produced by the algae.
(The worm-like creatures; burrowed; L:beneath the biomat) (The worm-like creatures; eating; its decaying underside) (The worm-like creatures; breathing; the oxygen produced by the algae) (the oxygen; produced; by the algae)
The worm-like creatures The worm-like creatures The worm-like creatures the oxygen
burrowed eating breathing produced
L:beneath the biomat
its decaying underside
the oxygen produced by the algae
by the algae