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B
Nose
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C
Teeth
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D
Ear
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Solution
The correct option is D Ear The snakes lack ears (no external appendages). However, they have fully formed inner ear structures without the ear drum. The inner ear structures are attached to the jawbone which rests on the ground. The vibrations generated by the prey or predator in the vicinity of a snake are sensed by the jaws which send a signal to the brain via the inner ear.