
Evolution of a lineage does not occur in a straight line toward a predetermined goal. Evolution is like a branching bush. When we look back into the past, we see that lineages often split and constituted new branches, each with several species. They were all well adapted to their environment and succesful for million of years. The species that live today are just the surviving members of one of the lineages.
 Each species is best adapted to its own environment. Most environments, however, change over time. This means that the species have to adapt to a new environment. This change underlies evolution. Living fossils exist only in environments that did not change for millions of years, sometimes up to hundreds of millions of years.
Tendances Évolutionnaires





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