The possessive forms are:
The possessive form of the plural noun Americans is Americans'.Example: Many Americans' lifestyles are harmful to the environment.
The possessive singular noun is explorer's. The possessive plural noun is explorers'.
The possessive form for the noun coyote is coyote's.
The possessive form of zoo is zoo's.
The possessive form for the noun preacher is preacher's.
The possessive form for the noun laboratory is laboratory's.
No, he is not possessive. The possessive form would be his.
The word American's is a possessive noun. It would be used in a context such as "An American's accent is very different from an Australian's accent." If there were more Americans, it would be written Americans' accents. Unfortunately, apostrophes are sometimes used incorrectly to show a plural. The plural of American is Americans, not American's.
The possessive form for the noun oxygen is oxygen's.
The possessive form is grandson's.
The possessive form is island's.
The possessive form for the noun coyote is coyote's.