GLGY 209 Chapter Notes - Chapter 11: Alanine, Alexander Oparin
4 May 2019
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Document Summary
Fossil record has a major role in documenting the various aspects of the evolution of life on earth. All these problems must be taken into consideration in studying the history of life. Oldest known organisms are small-sized, microscopical, and they were the only one that populated the earth for the longest part of its history. More complex organisms occur at higher levels in the fossil record. Theory of evolution explains the morphological, spatial, and temporal patterns i the fossil distribution. Oldest layers preserved in the earth"s crust usually are devoid of fossils; when found, most of these fossils are either small-sized, microscopal, or occur as large-sized communities of microscopical organisms. More complex fossils that occur in the younger layers, which have multicellular bodies with the cells separated at tissue and organ level, some of them with exoskeletons or internal skeletons.
