And a blended query for the best of both searches for you to bookmark could be https://www.inaturalist.org/observations/identify?project_id=unknowns-and-state-of-matter&apply_project_rules_for=low-growth-countries-and-territories&place_id=any
Remembering that a project is just a fancy search tool and when you blend two projects to ID it gets fancier.
(ed. a little while later - for those who are not familiar with URL modifications - by removing /indentify , the search will open up in Explore and show the countries that these “true unknowns” are limited to https://www.inaturalist.org/observations?project_id=unknowns-and-state-of-matter&apply_project_rules_for=low-growth-countries-and-territories&place_id=any )