Identify the use of the ablative case in the sentence: In silva habitamus.

The use of the ablative case in the sentence "In silva habitamus" is correctly identified as the ablative of place where. In Latin, the preposition "in" combined with the ablative indicates the location or place where an action takes place. In this instance, "silva" denotes "in the woods," indicating that the action of living (habitamus) occurs in that specific location. The ablative of place where answers the question of "where" the living is happening, making it a clear application of this grammatical concept.

Other options represent different functions of the ablative case and are not applicable in this context. The ablative of means would typically involve an instrument used to perform an action, the ablative of separation indicates the removal from a place or person, and the ablative of cause pertains to the reason or motive behind an action—all of which do not fit the scenario described in the sentence.