Introduction to The Notochord: Ancient Forerunner of the Vertebral Column Only within the last 500 million years or so have there been any chordates ( KOR -dates) – animals with some kind of “chord” ...
Introduction to The Phylum Chordata and Its Groups The Phylum Chordata can be subdivided into a number of different groups. The major classifying factor is the answer to the following question: “Does the particular chordate species being ...
Introduction to the Eight Different Classes of Vertebrates Although all vertebrates share a common core of characteristics, they still show a very wide degree of diversity or differences among them. This diversity is reflected in the ...