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LE Evolution

evolution the process of change through time
geologic evolution the process of how the structure of the earth has changed
organic evolution changes in the characteristics in populations through generations including differences in structure, function and behaviors
geologic record age of earth based on radioactive dating
fossil record remains or traces of organisms that no longer exist
petrification tissues of oranism gradually replaced with minerals
imprints trace made in soft sediment, such as mud that later turns to rock
comparative studies similarities between organisms structure, hereditary material, embryonic material show common ancestry
comparative embryology comparison of early embryonic development
theory of use & disuse new structures develop as an organism needs them and their size depends on the degree of use
overproduction population produces more offspring than can survive
competition between organisms for space, food, water and other limited resources
variations genetic differences in traits which result in certain individuals being better able to survive
natural selection some variations are more helpful so assist in survival of the fittest
speciation over an extended period of time, variations accumulate in a population and become so numerous as to result in a new species
segregation separation by physical barriers
geographic isolation isolation of population increases the changes for speciation
reproductive isolation members of isolated populations can no longer interbreed with members of main population resulting in 2 different species
gradualism slow, gradual and continuous via minor changes
punctuated equilibrium ecosystem remains relatively stable for long periods of time
Created by: jgarrisi



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