Chord - one of the largest types of the animal kingdom, whose representatives have mastered all the habitat. The structure of this type consists of three groups (subtypes) organisms, tunicates (including benthic sessile marine organisms - sea squirts), bescherepnyh (like little fish sea creatures - lancelet), vertebrates (cartilaginous and bony fish, amphibians, reptiles, birds and mammals).... If you get more information, visit our site: BEST ESSAY CHEAP
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