hollow bones are distinctive characteristics of animals classified as vertebrates.
hollow bones are distinctive characteristics of animals classified as vertebrates.
distinctive characteristics of animals classified as vertebrates include?
hollow bones
Na
Na
the original scheme groups hagfish and lampreys together as cyclostomes (or historically, agnatha), as the oldest surviving class of vertebrates alongside gnathostomes (the now-ubiquitous jawed vertebrates). the alternative scheme proposed that jawed vertebrates are more closely related to lampreys than to hagfish (i.e., that vertebrates include lampreys but exclude hagfish), and introduces the category craniata to group vertebrates near hagfish.









































section::::physical characteristics.









































section::::physical characteristics.:body features.
hagfish