Life in land
Life in land is much more demanding than life in the sea
problems of body support and locomotion are more complex.
the physical condition such as temperature vary far more and the abundance of food changes according to the season more than it does in the sea. But if animal can cope with these conditions, it may be able to return to the sea and compete successfully with the more conservative animals which never left the sea three or four types of reptile have returned to the sea in this way , using both of the two basic ways of swimming.
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