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Chapter

PRAC GLOSSARY9-10

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Department
Biology
Course
BIO2231
Professor
Various
Semester
Fall

Description
PRAC 9 GLOSSARYNotochordAn elongated cartilaginous cellular cord enclosed in a sheath which forms the axial skeleton of chordate embryos jawless fishes and adult cellular chordatesMyotomeThe part of a somite destined to form muscle the muscle group innervated by a single spinal nerveMetamorphosisSharp change in form during postembryonic developmentPaedomorphosisretention of ancestral juvenile features in later stages of the ontogeny of descendantsTrimerousBody in three main divisions as in lophophorates and some deuteostomesEndostyleMucussecreting ciliated grooves in the floor of the pharynx of tunicates cephalochordates and larval jawless fishes useful for accumulating and moving food particles to the stomachAmmocoetesThe filterfeeding land stage of lampreysPharyngeal slitsFilterfeeding organs found in nonvertebrate chordates and aquatic hemichordatesGillsRespiratory organ found in many aquatic organisms that extracts dissolved oxygen from water and excretes carbon dioxidePRAC 10 GLOSSARYEctothermicHav
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