Assertion: hermit crab's exoskeleton | /r/HasProperty | old
Facets:
Source sentences:
text: According to the HCA, they shed their old exoskeletons once or twice a year in order to grow, so they need calcium to grow new exoskeletons beneath the old ones.
text: According to the HCA, they shed their old exoskeletons once or twice a year in order to grow, so they need calcium to grow new exoskeletons beneath the old ones.