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differences among individuals of a species; results from mutation and sexual reproduction
survival of the fittest
individuals that are better suited to their environment survive and reproduce most successfully; natural selection
individuals that are better suited to their environment survive and reproduce most successfully; survival of the fittest
structures that have different mature forms but develop from the same embryonic tissues
organ so reduced in size, it does not serve an important function; may be homologous to structures in other organisms
two organisms that are so similar they can interbreed in nature and produce fertile offspring
separation of species that prevents them from interbreeding and producing fertile offspring
type of reproductive isolation in which two organisms have different mating rituals that prevent them from interbreeding
type of reproductive isolation in which two populations are separated by geographic barries like mountains or bodies of water
two part scientfic name for an organism; its genus is listed first, followed by its species
second largest taxonomic group; there are six - animalia, plantae, protista, eubacteria, archaebacteria, fungi
most inclusive taxonomic group, larger than kingdom; three exist - bacteria, archaea, eukaryota
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