![]() ![]() The Rise of the fish - The Ordovician Period (505.The Cambrian Explosion - The Cambrian Period.The first algae - 1200 million years ago - The Proterozoic.Birth of Earth - approximately 4600 million yearsĪgo - The Hadean Period (4600 m.y.List of useful reference websites at the very end of the sections Their biological and geological significance. The evolution of life is organised into 20 sections referring to For further information on each geological period or special life forms mentioned, there are links to other websites about this time. Prokaryotes, for example are the most successful and abundant organisms on Earth, in both numbers and biomass and still make up to 90% of the total weight of living things. ![]() Many life forms that were not mentioned in this text were very successful and have evolved or in some cases maintained a very successful life strategy. However this should not give the impression that the evolution of life on Earth is or was a sequential event. For reasons of simplicity some important events and life forms were selected for each geological time span. This section provides information about the evolution of life on Earth. ![]()
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