How to use in-sentence of “urchin”:
+ In 1982 at the Marine Biological Laboratory at Woods Hole, Massachusetts, he used the sea urchin egg as his model organism.
+ In some places, sea urchins eat so many kelp plants that the kelp forest becomes an urchin barren.
+ In some places, kelp forests turn into urchin barrens and then grow back depending on the currents that year.
+ The teeth of the pink sea urchin chip against each other to stay sharp.
+ The spines are long and sharp in some species, Rubber slippers will protect feet and protect the urchin from predators.
+ In some parts of the Pacific Ocean, sea urchins have eaten so much kelp that the kelp forests become urchin barrens.
+ They ate and killed so many kelp plants that they turn kelp forests into desert-like places called urchin barrens.
