A frog has

Options

A. Eyes but no lids
B. Jaws but no teeth
C. Hands but not fingers
D. Ears but not pinnae

Answer

To answer the question "A frog has which of these options?" we need to analyze each option provided:

1. **Eyes but no lids**: Frogs have prominent eyes that are equipped with three eyelids: a thick upper eyelid, an ill-developed lower eyelid, and a transparent nictitating membrane (the third eyelid). Therefore, this option is incorrect because frogs do have eyelids.

2. **Jaws but no teeth**: Frogs possess two types of teeth: maxillary teeth and vomerine teeth. These teeth are used primarily for gripping prey. Hence, this option is also incorrect as frogs have both jaws and teeth.

3. **Hands but not fingers**: Frogs have two pairs of limbs. The forelimbs (commonly referred to as hands) have four digits (which can be considered as fingers), while the hindlimbs (often referred to as feet) have five digits. Therefore, this option is incorrect as frogs do have fingers.

4. **Ears but not pinna**: In frogs, the external part of the ear (the pinna) is absent. Frogs have a tympanic membrane that serves as their eardrum, but they do not have the external ear structure found in mammals. Thus, this option is correct.

Based on the analysis, the correct answer is: **Ears but not pinna.**