The body of a frog can be divided into a __________________, which extends posteriorly to the shoulders, and a __________________. The __________________ opening is the combined opening of the digestive tract and urogenital tracts at the posterior end of the frog just dorsal to the junction of the hind legs. A large mouth, a pair of nostrils (external __________________), and the eyes are recognizable on the anterior end. The upper eyelid is a simple fold of skin. The lower is a transparent __________________ membrane that can be drawn across the surface of the eyeball. The disc-shaped structure posterior to each eye is a flat eardrum called the __________________ membrane.

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