Organism Physiology Paper

Topics: Heart, Circulatory system, Stomach Pages: 2 (811 words) Published: October 28, 2014

Organism Physiology Paper
The Physiological Evolution of the Crocodile

Mother Nature diversity in regards to the animal kingdom is amazing. Throughout the Centuries, there have been changes to the globe and therefore to the habitat of the humans, animals, plants and all of the infinite organisms that live in our planet. However, even though there have been changes, the living organisms also have adapted to their new environment by changing their genetic composition and acquiring new characteristics that allow these organisms to survive and to get well adapted to the prevailing environmental conditions. One of the best adapted living organisms from the prehistoric era to the present history period are believed to be the crocodiles or alligators, who are considered the cousins of the dinosaurs. According to the website About.com, there have been 200 million years of crocodile evolution. Crocodiles are believed to be the offshoot of the archosaurs, which were the “ruling lizards” of the early to middle Triassic period. These species resembled one another in many physiological features, for examples the shape and musculature of their deadly jaws. However, it has been only 65 million years ago that crocodiles developed their well-known traits: stubby legs, sleek bodies, and marine lifestyles. One of the most distinctive features of the modern day crocodiles is their elongated snout. The size of their head is typically one seventh of the total body length, and the shape of the head is intimately associated with the way crocodiles position themselves in the water. They usually have a minimum exposure posture in the water, making it easy for them to prey on other animals and even humans. The “minimum exposure” posture has played an important key throughout 121920044640500their evolution. The internal organs of the crocodiles are just as unique and specialized as the external physiological features. They do not have a diaphragm separating the chest cavity...

References: University of Edinburgh. (2014, October 15). Prehistoric crocodiles ' evolution mirrored in living species. ScienceDaily. Retrieved October 22, 2014 from www.sciencedaily.com/releases/2014/10/141015101725.htmStrauss, B. (n.d.). Here 's Why Crocodiles Haven 't Changed Much in 200 Million Years. Retrieved October 22, 2014, from http://dinosaurs.about.com/od/typesofdinosaurs/a/crocodilians.htmVertebrates. (n.d.). Retrieved October 22, 2014, from http://greenhillapbiology2009rotating.wikispaces.com/26. Vertebrates
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