how many groups are there in protochordata ?what are they? what are the differences present in them?
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Protochordates are an informal category of animals (i.enot a proper taxonomic group), named mainly for convenience to describe invertebrate animals that are closely related to vertebrates.These animals have pharyngeal gill slits and a dorsal nerve cord, which is usually solid.
Protochordata are divided into three most important sub-categories based onthe kind of notochord they possess, namely Hemichordata, Urochordata and Cephalochordata.
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