Assertion: arthropod's exoskeleton | /r/HasProperty | hardened
Facets:
Source sentences:
text: The exoskeleton is hardened and is made of chitin.
text: Ans: The exoskeleton in Arthropods is hardened and is made of chitin.
text: the animal emerges and swells to a larger size until the newer, larger exoskeleton is hardened.