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Once multicellular organisation became possible as atmospheric oxygen levels rose, the early multicellular organisms rapidly diverged into many adaptive forms.Mass extinction events and an organism's unique adaptations mark the history of evolution, both of which may lead to adaptive radiation.Very simply, there are five basic principles to this theory: [1] Variation has a genetic origin ( heritable) and arises through processes such as mutation and recombination.Evolution & Ecology " (see its HOME PAGE .) The result is that some areas, such as the glossary are shared.

methods rely on characteristic faunal and geological patterns to bracket the period when the fossil existed.The evolution of a species is linked to the environment.Adaptation is a continuous response to the environment by changeable species.Between the mid-1930s and mid 1940s geneticists, systematists and palaeontologists collaborated to create a united approach to evolution, the "Modern Synthesis".Ernst Mayr reduced all the hominid (human ancestor: (see hominid books)) fossil records to three species, A.

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