Members of the phylum Chordata have ________ just behind their mouths that extend to the outside environment.

a. book gills
b. pharyngeal slits
c. tonsils
d. madreporites


b. pharyngeal slits

Members of the phylum Chordata have pharyngeal slits just behind their mouths that extend to the outside environment. In organisms that live in aquatic environments, they allow for the exit of water that enters the mouth during feeding. In jawed fishes, they appear as gills, and in tetrapods, they are modified into parts of the ear and tonsils.

Biology & Microbiology

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