By Susan Dale (Eds.)
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Additional resources for Dale's an Introduction to Social Biology
6 (b) ) up to the present day. It is not easy to do this for many animals, because o f the very great odds against any particular animal being fossilised, and even when this did happen, the likelihood o f its being dug up b y a palaeontologist is even more remote. In the case o f forest dwelling creatures this is particularly so, for, in the acid soils o f forests, bones tend to rot long before they can become fossilised. This fact accounts for the scarcity of fossils of the Primate group to which man and the apes belong.
D r a w i n g of a transverse section of a three-day-old chick e m b r y o a p p r o x i m a t e l y along the line A t o Β in F i g . 15. cut persisting only in the regions where they are found to-day. Then, amongst these survivors, locally distinct changes t o o k place, resulting in the three cedar types we k n o w n o w . Evidences from Embryology. In studying the development of plants and animals from the fertilised egg to the adult stage, biologists have discovered surprising facts, which, in the absence of the theory of evolution would be unintelligible and meaningless.
Dawson claimed to have discovered the first bit o f Piltdown skull and the mandible in 1908. These finds were not made public until 1912. Then Dawson found in 1915 the portion o f another skull at Sheffield Park near t o Piltdown. Several local amateurs and a few professionals would not accept these sub-human skulls, nor the flint tools, but they were swamped b y leading palaeontologists who made careful examinations and reconstructions o f the skull and jaw. The examinations were usually made on plaster casts.