Assertion: archaeologist's opportunity | /r/HasProperty | afforded by north-south diversity
Facets:
value: in ecosystems
type: LOCATION
value: across deserts
type: LOCATION
value: across forests
type: LOCATION
value: across grasslands
type: LOCATION
Source sentences:
text: Symbiotic trade relations developed before the trans-Saharan trade, in response to the opportunities afforded by north-south diversity in ecosystems across deserts, grasslands, and forests.