The noun 'wildlife' is an uncountable noun, a type of aggregate noun, a word representing an indefinite number of elements or parts.
Wilderness'
The plural form is also Wilderness'
Wilderness'
The singular possessive is fish's.
Buzz's is the singular possessive.
The possessive form is Amos's.
Mary's is the singular possessive form.
The singular possessive form is foot's.
Quantum is singular, not singular possessive. The singular possessive form is quantum's.
The noun wilderness can be singular or plural; wilderness is the singular, wildernesses is the plural form.
Museum is singular. Museum's is singular possessive. Museums is plural. Museums' is plural possessive.
The singular possessive pronouns are mine, yours, his, hers, and its. The singular possessive adjectives are my, your, his, her, and its.
The singular possessive of dish is dish's
Grave's is the singular possessive.
The singular possessive is test's.
The singular possessive is Martin's.
The singular possessive is fish'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.