Human are chordates and all chordates possess paired gill pouches. Then why humans don't have gills?
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Please find below the solution to the asked query:
Animals belonging to phylum-Chordata are characterised by the presence of a notochord, a dorsal nerve cord and paired pharyngeal gill slits. All other animals including humans and other mammals possess a notochord, but it usually appeared only early in embryonic development and then disappeared. Similarly gill slits present in the embryos of all chordates, including humans but not in adults (except fishes and a few amphibians). Humans as terrestrial or land dwelling animal have lost their gills during the evolutionary process which remains there in fishes and other amphibians because they need gills to survive underwater. Gills help in absorption of oxygen from water similarly humans take oxygen from the air through lungs.
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Please find below the solution to the asked query:
Animals belonging to phylum-Chordata are characterised by the presence of a notochord, a dorsal nerve cord and paired pharyngeal gill slits. All other animals including humans and other mammals possess a notochord, but it usually appeared only early in embryonic development and then disappeared. Similarly gill slits present in the embryos of all chordates, including humans but not in adults (except fishes and a few amphibians). Humans as terrestrial or land dwelling animal have lost their gills during the evolutionary process which remains there in fishes and other amphibians because they need gills to survive underwater. Gills help in absorption of oxygen from water similarly humans take oxygen from the air through lungs.
Hope this information will clear your doubts about the topic.
If you have any more doubts just ask here on the forum and our experts will help you out as soon as possible.
Regards