Assertion: horseshoe crab's blood | /r/HasProperty | exposed to air
Facets:
Source sentences:
text: Oxygen is carried in the blood of the horseshoe crab by a molecule that contains hemocyanin, which contains copper causing the blood to turn blue when exposed to air.
text: Most red-blooded animals carry oxygen in iron-rich hemoglobin causing their blood to turn red when exposed to air.
text: The blood of horseshoe crabs turns blue when exposed to air.