Final answer:
The mandibular branch of the trigeminal nerve (CN V3) supplies the lower ear, mastoid process, and angle of the mandible, as well as other structures in the lower face and jaw.
Step-by-step explanation:
The nerve that supplies the lower ear, mastoid process, and angle of the mandible is the mandibular branch of the trigeminal nerve (CN V3). This nerve provides sensory innervation to the lower face, including the lower teeth, chin, jaw, and parts of the ear. It also supplies motor innervation to the muscles involved in chewing.