ARCHEOCETI, CETACEI DI TERRA E DI MARE (ARCHEOCETI, CETACEANS OF LAND AND SEA)

[flyingscience]

6 until all' Africa, Europe, America and Australia. The Archeoceti 35 million years were extinguished ago, leaving the place the Novoceti, that is to the ancestors of it puts into effect them dolphins and whales that still today are the far descendants of the mammals that a time walked on the mainland

[flyingscience]

5 Tetide was extended dall' it puts into effect them Iberian peninsula until all' Indonesia and its coastal, warm and rich waters of life, attracted first archeoceti in try of food and new atmospheres to colonize. With progressing of their adaptation to the aquatic life, the archeoceti they were pushed more and more towards the open sea and, in little million years, were diffused dall' India and from Pakistan, they origin centers,

[flyingscience]

4 The teeth, than in the archeoceti still were differentiated, like in their terrestrial ancestors, became all equal ones and of conical form in the dolphins that seize the prede and they swallow to them without to chew, while in the whales they will be replaced from the fanoni, corneous sheets that serve to filter great amounts of Krill and little ones fish of which nutrono. Between 55 and 34 million years ago l' the ocean of the

[flyingscience]

3 The posterior limbs were reduced via until disappearing and the front limbs were transformed in fins, the collo were shortened, the hair scomparve and the tail irrobustì till to develop the characteristic fin. Also the skull went in against to great changes: gradually the narici were moved dall' extremity of the snout to the top of the head, till to form that one sfiatatoio that it allows to whales and dolphins to breathe hardly grazing the surface of the sea.

[flyingscience]

bable fish translation 2:the ippopotami, based on the study of the DNA indicates that them like tightened relatives of the cetacei and l' hypothesis of the artiodactyls them that it characterizes the progenitor of the archeoceti in a terrestrial mammalian little one who lived ago on our planet 50 million years Nell' arc of little million years, the archeoceti we from the perfectly hydrofoil body transformed ourselves from terrestrial quadrupeds to aquatic animals

[flyingscience]

The studies in order to characterize the progenitors of the archeoceti are still in course and, own during the last few years, important discoveries have allowed to formulate new theories. Al moment the more reliable hypotheses are three: l' hypothesis of the mesonichidi, second which the ancestors of the cetacei antichi would be ungulati similar to hyenas for aspect and dimension. L' hypothesis of