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on the origin of species
what established evolution by a common descent as the dominant scientific explanation of diversification in nature
a mechanism for changes in populations that occurs when organisms with favorable variations survive, reproduce and pass on traits to the next generation
random fluctuations in the frequency of appearance of a gene in a small isolated population, presumably owing to chance rather than natural selection
transfer of genes from one population of the same species, as by migration or the dispersal of seeds and pollen
a common ancestor
what do species have to share in order for the distribution patterns across the globe to make sense
that modern species should be found close to where their ancestors were, regardless of environmental conditions
what does the evolutionary theory predict
the fact that islands contain plants and animals that are closely related to the species on the nearest mainland
what indicates that early ancestors of species migrated, and as the environments changed, the organisms adapted to their unique island over time
whether or not the organisms are closely related
what can scientists determine by comparing dna sequences
the relationship between closely related species
what relationship can be used to contruct evolutionary pathways
the fewer turns you take, the more closely related organisms are
what is true of the philogenic tree/platogram
provide evidence for evolution; remains of once living things that are preserved in earth's rocks
have different FUNCTION but the same STRUCTURE; these similarities indicate that the organisms probably had a common evolutionary origin (limbs)
have body parts that are similar in FUNCTION but different in STRUCTURE. these indicate that the organisms probably had different yet related ancestors (wings)
they show structural changes over time
how do functionless structures such as the appendix and the eyes of cavefish support the theory of evolution
they are more physiologically resistant
how do organisms that have been exposed to antibiotic and pesticides survive in their environments
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