Evidences of evolution

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Presentation transcript:

Evidences of evolution

Fossils Found species that don’t exist anymore Relative Dating: Determine how old the earth is by layers/fossils in the rock Absolute Dating: Use half-lives (time required for half of sample to decay) to determine the age of rocks

Geographic distribution Find common ancestors of organisms that have changed because of their environment Find organisms that are not related but look similar due to their environments

Homologous body structures Structures in different organisms that came from a common ancestor (fins of a whale and a human arm) Opposite of homologous is analogous structures (perform similar functions but are not related)

Embryonic development Embryos look alike when in first stages of development

Dna similarities