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The evolution to multicellular organisms determined the appearance of more sophisticated and specialized systems for the different physiologies like integumentary, respiration, digestion, excretion, circulatory, reproduction, skeletal and the nervous system. In the line of chordate evolution, advent of tetrapods have triggered the events leading to only partial dependence on water for physiological activities. The inconstant environment in which animals lives largely determine and guides the way animal physiology evolves. This directs the anatomical and morphological changes in the organism th

Chordata. --- Vertebrates.

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A fully updated, new edition of the definitive listing of Australia's vertebrates and their conservation status.

Vertebrates --- Vertebrata --- Chordata

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Chordata --- Anatomy, Comparative

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Morphology (Animals). --- Embryology. --- Chordata.

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Graptolites flourished from earliest Ordovician to Early Devonian, a time range of about 90 million years, and were widely distributed as marine benthic and planktonic colonial organisms around then-world. They were diverse and rapidly evolving and, as such, make excellent ""index fossils"" for relative age-dating of their enclosing basinal rocks.

Graptolites. --- Chordata, Fossil.