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That phenomenon when animals left water open spaces, was considered by scientists at the beginning of the 20th century. Now Matthias Green from the University of Bangor became interested in this feature. As stimulation to development of extremities for movement drying of reservoirs served by land. The appeared grounds did not contain enough food. And to overcome distance to the next water space, animals needed to make certain actions. The exit of animals to the land was explained with the impact of strong inflows.
Scientists note that 400 million years ago the orbit of the Moon was closer to the land surface for 10% . It had significant effect on force of inflows and otliv. As result, a part of animals it was cut off from the main water world separated by a ground.
In the conditions of limited space there was a strengthened stimulation of mammals to active actions. It was caused by continuous reduction of amount of food which had no place to be replenished.
selection was resulted by the following:
Fishes with strong fins thanks to what they could make a start from a surface in the course of movement fell into the best state .
For the purpose of confirmation of this theory works on modeling of coastlines where often there were inflows and otliva were carried out. For example, space of the sea decreased due to rapprochement of continents Gondwana and Lavrussiya.
Results of a research showed that these processes had to be followed by the strengthened inflows and otliva. Tell paleontologic finds in the form of bone deposits with transitional fins about confirmation of this theory.