John Updike Evolution of Sirenia Many scientists believe that sirenians evolved closing curtain to fifty-five million years ago from sm in all foot animals. The closests living relatives today are elephants and small Asian mammals called hyraxes. Although in that location are vast differences between elephants, hyraxes, and sirenians, fossil bear witness 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 capacious animals.
thither are five species of Sirenia, but scientists theorize that there were numerous more in the past. Early forms of manatees are theme to cast originated near the Amazon basin in southward America. about remained there to become the Amazonian manatee, while others migrated up done 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, point it on our website:
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