BIOL 103 Final: BIOL103 NOTES
27 Sep 2017
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Anatomy biological form of an animal physiology biological function. 40. 1 animal form and function are correlated at all levels of organization. Animal shape and size are fundamental aspects of body plan and at all levels form and function are correlated. Evolution does not occur through conscious intervention but by selection of individuals with greatest fitness, as the sum of a range of random mutations. Many body plans have arisen through the course of evolution variations fall within certain bounds due to limits of physical laws (strength, heat exchange, diffusion etc. ) Exchange with environment is a fundamental function and complexity increases with size of organism. Unicellular organisms have direct contact with their environment at all times. Small multicellular organisms like a hydra may have a very high degree of contact with environment as they may only have bodies that are two cell layers in thickness. Fluids found filling the spaces between cells are interstitial fluids .
