Pronouns usually substitute for nouns and function as nouns, e.g., I, you, he, she, it, we, they, myself, this, that, who, which, everyone. Verbs express actions, occurrences, or states of being, e.g., be, become, bunt, inflate, run. Adjectives describe or modify nouns or pronouns, e.g., gentle, helpful, small.
Answer: a noun is a person, place, thing, or idea. For example, a bicycle. A pronoun takes the place of a noun. For example, that or he or it. An adjective modifies or describes a noun, such as new or ugly or broken.
The Mayans lived in a ranimich environment, tropical and with abundant plants and animals and at least locally, at Copan in the onduras they had fertile soil for agriculture. They declined after about the 9th century but the reason why is not known yet. The Pitcairn Islanders on the other hand, the Polynesians were only a handful to start with and had to flee when the limited resources gave out.