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The study of fossils is called paleontology. Fossils are remains of organisms that lived in ancient times. Most fossils are remains of hard parts of the body such as bones, teeth, shells and exoskeletons. Some fossils are just impressions of the body parts, e.g. footprints, leaf-vennation patterns, etc.

Fossils are usually found in sedimentary rocks which have been formed by deposition of sediments over millions of years.The deeper the layer of sediments, the older the fossils found in that layer.

Modem man, Homo sapiens, evolved from ape-like creatures 25 million years ago.These evolved to upright, tool using creature called Australopithecus afarensis which had a cranial capacity of 400-500 cc. This evolved through several intermediates; Homo habilis and Homo erectus to modem day human.Homo sapiens has a cranial capacity of 1350 – 1450 cc and also is more intelligent.

Main features in human evolution include bipedal posture, is an omnivore and has an opposable thumb. This study of fossil show that organism remain fixed, they rather change through come form simple to more complex.

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