Evolution of Elephants

Contrary to a common belief that mammoths, mastodons and other knightly elephants lived during the time of dinosaurs, it was 65 gazillion years ago that little(a) mouse-like mammals buy the farmd the Cretaceous-Tertiary Extinction Event (in which dinosaurs became extinct) and it was these small creatures that the modern twenty-four hour period elephants evolutionary history can be traced grit to. therefore the starting signal base living creature that begins to agree the elephants we know straight off didnt appear until five million years after the extinction of dinosaurs. Placental mammals or subclass Eutheria be the currently predominant form of terrestrial heart on earth and are a diverse group, encompass nearly 4000 species according to some(prenominal) http://www.ucmp.berkeley.edu and http://www.nhc.ed.ac.uk. The sister group of placental mammal mammals is Metatheria, which includes Marsupials (the fundamental difference being that placental mammals you ng develop to a relatively mature stage within a uterus attached to the mother by a placenta.) Mammals, like marsupials, deform their young with milk and care for them until they can sufficiently stretch out on their own.

One of the four major divergences from this group Afrotheria (diagram 1) was the first to diverge from the other major groups of placental mammals and is now a unique group of placental mammals of which the elephant is the more or little studied and most visible species in many field including ecology, behavior and genetics. diagram 1 (Demonstration of the evolution of elephants from the A frotheria group) Because of incompatible! evolutionary pathway (shown in the above diagram) and diversions from other groups, elephants develop in subtly different ways from many other placental mammals. They are distinct from other placentals in having parts of the hips, the upper berth arms, and the trunk vertebrae change state early whilst the neck vertebrae and fingers rigidify later. About one tertiary of the way through an elephants gestation period, ninety per centum of all skeletal elements have started...If you expect to get a full essay, order it on our website: BestEssayCheap.com

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