You have the correct form for the singular possessive noun snake: snake's.
Example: We saw a snake's trail in the sand but we didn't see a snake.
The possessive form of the plural noun snakes is snakes'.Example: The snakes' role on a farm is to reduce the number of rodents.
The possessive singular noun for snake is snake's, e.g. "The snake's fangs are very sharp."The possessive plural noun for snake is snakes', e.g. "There's a pile of old snakes' skins over there."
The singular form for the plural noun snakes is snake; the singular possessive form is snake's.
The possessive form for "the rattle of the snake" is the snake's rattle.
Rattlesnakes is already plural. The plural of rattlesnake is rattlesnakes.
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 possessive form for the noun oxygen is oxygen's.