Final answer:
The two cavities inside the eyeball are the anterior cavity, which is filled with aqueous humor, and the posterior cavity, containing the vitreous humor.
Step-by-step explanation:
The interior of the eyeball is divided into two distinct cavities, known as the anterior cavity and the posterior cavity. The anterior cavity is situated between the cornea and the lens, which includes the iris and the ciliary body, and is filled with a liquid called the aqueous humor. The posterior cavity lies behind the lens and reaches back to the interior side of the eyeball up to the retina. This cavity is occupied by the vitreous humor, a gel-like substance that maintains the shape of the eye and provides a clear pathway for light.