Assertion: sea urchin's spine | /r/HasProperty | strong
Facets:
Source sentences:
text: Adult sea urchins are usually well protected against most predators by their strong and sharp spines, which can be venomous in some species.
text: Adult sea urchins are usually well protected against most predators by their strong and sharp spines, which can be venomous in some species.
text: Adult sea urchins are usually well protected against most predators by their strong and sharp spines, which can be poisonous in some species, but when they are damaged they quickly attract lots of fish and other omnivorous animals.