John Updike

John Updike Evolution of Sirenia Many scientists believe that sirenians evolved close to fifty-five million years ago from sm entirely foot animals. The closests living relatives today are elephants and small asian mammals called hyraxes. Although there are vast differences between elephants, hyraxes, and sirenians, fossil evidence shows that all three evolved from a common ancestor. The manatees corporal characteristics are visible remnants of their ancient heritage. The dugongs tusks are another link to elephants. Like elephants, sirenians are enormous animals.

thither are five species of Sirenia, but scientists theorize that there were numerous more in the past. Early forms of manatees are thought to cast originated near the Amazon basin in South America. about remained there to become the Amazonian manatee, while others migrated up through the Caribbean, magnanimous rise to the Antillean and Florida manatees. Another group managed to swim or where carried on currents acro...If you want to get a full essay, order it on our website: Ordercustompaper.com

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