The singular is doe.
The plural is does and the plural possessive is does' (e.g. The does' behavior is determined by their ages.)
The possessive form of the singular noun doe is doe's.
example: The doe's baby sat quietly in the tall grass.
The plural form is does.
The possessive form of the singular noun doe is doe's.example: The doe's faun sat quietly in the tall grass.
Quantum is singular, not singular possessive. The singular possessive form is quantum's.
Museum is singular. Museum's is singular possessive. Museums is plural. Museums' is plural possessive.
The singular possessive pronouns are "my," "mine," "your," "yours," "his," "her," and "its."
The singular possessive of dish is dish's
The singular possessive is Martin's.
The singular possessive is fish's.
Grave's is the singular possessive.
The singular possessive form of "test" is "test's".
Buzz's is the singular possessive.
The singular possessive is biker's; the plural possessive is bikers'.
The singular possessive of criteria is criteria's.