The gill-slits of chordates occur in

Buccal cavity of aquatic animals

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Pharynx of all land vertebrates

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Pharnyx of all chordates embryos and pharynx of some aquatic adult chordates

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Pharynx of all aquatic and land vertebrates in adults as well as in their embryos

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Solution

The correct option is C Pharnyx of all chordates embryos and pharynx of some aquatic adult chordates
Gill slits are individual openings to gills, i.e., multiple gill arches, which lack a single outer cover. These can be traced in cartilaginous fish, such as sharks and rays. Early embryos of different vertebrates resemble each other in possessing certain similar structures, like gill slits. Therefore gill slits of chordates occur in the pharynx of all chordates embryos and pharynx of some aquatic adult chordates. Hence, option C is correct.

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