Life on Earth can be traced back over three billion years into the
past. Many examples of the Earth's former inhabitants are to be
found in rocks, preserved as beautiful and fascinating fossils. The
earliest life forms were bacteria and algae; these produced the
oxygen that enabled more complex life forms to develop. About 600
million years ago multi-cellular organisms appeared on Earth, some
of which could protect themselves with hard parts such as shells.
Many of these life forms were readily fossilized and are used to
subdivide geological time. Numerous species have evolved and most
are now extinct. Lineages can be traced and extinctions explained
as a consequence of terrestrial and extra-terrestrial events. Now
in a revised, updated and expanded Second Edition Introducing
Palaeontology will continue to provide readers with a concise and
accessible introduction to the science of palaeontology.
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