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| The process by which individuals that are better adapted to their environment survive and reproduce more succesfully than less well adapted individuals do; a theory to explain the mechanism of evolution |
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| A group of the same organisms of the same species that live in a specific geographical area and interbreed |
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| The process of becoming adapted to an environment; an anatomical,physiological, or behavioral trait that improves an organism's ability to survive and reproduce |
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the inability of a species to breed successfully with related species due to geographical, behavioral, physiological, or genetic barriers or differences
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| The process by which two or more related but reproductively isolated populations become more and more dissimilar |
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| The formation of a new species as a result of evolution |
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| active demand by two or more organisms or kinds of organisms for some environmental resource in short supply |
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| In evolutionary theory, ameasure of an individuals's hereditary contribution to the next generation |
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| The evolution of two or more species that is due to mutual influence, often in a way that makes the relationship more mutually beneficial |
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| A relationship between two species in which one species, the predator, feeds on the other species, the prey |
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behavior or artifice designed to deceive or hide
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| a defense in which one organism resembles another that is dangerous or poisonous |
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| In general, any movement of individuals or populations from one location to another; specifical, periodic group movement tht is characteristic of a given population or species |
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to be or become inactive or dormant
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| divergence in the structural or functional characteristics of an organism from the species or population norm or average |
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| The movement of genes into or out of a population due to interbreeding |
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| The random change in allele frequency in a population |
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| A change in the nucleotide-base sequence of a gene or DNA molecule |
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| The porportion of gene copies in a population that are a given allele, expressed as a percentage |
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| A structure in an organism that is reduced in size and function and that may have been complete and functional in an organism's ancestors |
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| Anatomical structures in one species that, compared to other anatomical structures in other species, originated from a single anatomical structure in a common ancestor of the two species |
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| The trace or remains of an organism that lived, long ago, most commonly preserved in sedimentary rock |
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| isotopes that have an unstable nucleus and that emits radiation |
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| The time required for half of a sample of a radioactive isotope to break down by radioactve decay to form a daughter isotope |
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