Assertion: coral reef | /r/HasProperty | limited in their geographic distribution
Facets:
value: because of their unique relationship with zooxanthellae
type: CAUSE
value: to 30 degrees
type: OTHER
Source sentences:
text: Because of their unique relationship with zooxanthellae, which require sunlight and warm water to live, coral reefs are limited in their geographic distribution to 30 degrees north or south of the equator.