Final answer:
The underlined phrase in the sentence is an adjectival clause that describes the location of the habitat.
Step-by-step explanation:
In the sentence "The animals' habitat was in the direct path of the forest," the underlined phrase "of the forest" is an adjectival clause. Adjectival clauses function as adjectives to modify a noun or pronoun. In this case, the adjectival clause describes the location of the habitat.
Learn more about Adjectival Clause