The history of world is a history of survival. For millions of years species have been in deadly fight for survival. Endangered by climate changes, diseases, viruses, catastrophes, and other species, they passed their genes to successors, hoping that at least the strongest of them will manage to win in the fight for survival. Many did, but many did not. Scientists exploring the remains of the living creatures of the past, have concluded that the most successful living organisms were the most flexible ones. Environment was remorseless. The conditions could drastically change from one year to another, from one month to another and even over the night. Because of that, living creatures were doomed to die, unless they changed the way they ate, slept, and lived. That was often impossible, without changing the information carriers- individuals, themselves. The nature solved this problem by natural selection. Only those who could conform to the new conditions survived. In this way the species renewed themselves, and by doing that, they were better prepared for the challenges on their way.
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