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Question

The early stage human embryo distinctly possesses

A
Gills
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B
Gill slits
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C
External ear (Pinna)
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D
Eye brows
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Solution

The correct option is B Gill slits
Possession of pharyngeal gill slits and gill pouches is one of the three diagnostic characters of chordates. So, these structures do appear in the embryonic stages of all vertebrates.

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