Question

In vertibrates the pharyngeal gill slits are not more than

Answer 1

Answer:

Pharyngeal slits are a third chordate feature; these are openings between the pharynx, or throat, and the outside. They have been modified extensively in the course of evolution. In primitive chordates, these slits are used to filter food particles from the water. In fishes and some amphibians, the slits bear gills and are used for gas exchange. In most land- living chordates, the "gill slits" are present only in embryonic stages; you had pharyngeal slits at one time. The slits are supported by gill arches, which have also been highly modified in various groups of vertebrates.

Lastly, all chordates have a post-anal tail, or extension of the notochord and nerve cord past the anus. This feature is also lost in the adult stages of many chordates, such as frogs and people.

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