Yes, "Native American" is a proper adjective for indigenous peoples of America.
No.
Yes. America is always capitalized -- even if it is being used as an adjective.
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Yes
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The proper adjective is American, describing the noun 'literature' as 'of America'.
The proper adjective for Inca is Incan. An example sentence: They traveled to South America to tour the Incan ruins. In Spanish, the proper adjective is Incaico, as in Imperio Incaico (Inca Empire)
South America is a proper noun due to it being the name of a place.
The proper adjective form is European. (It is also the demonym for a person from Europe.)
No, "animal" is not a proper adjective; it is a common noun. Proper adjectives are derived from proper nouns and are capitalized, such as "American" from "America" or "French" from "France." In contrast, "animal" can be used as a common adjective when describing something related to animals, but it does not meet the criteria of a proper adjective.
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