Evolution - Change in a kind of organism over time, Harmful Mutation - A mutation that decreases the fitness of the organism, Beneficial Mutation - Any change to the genetic code that results in noticeable physiological changes that are of benefit to the organism, Homologous Structure - structures that have different forms in different organisms but develop from the same general structure. Supports idea of common ancestor, Analogous Structure - Similar function but different structure, does not show common ancestry, Selective Breeding - Selection by humans for breeding of useful traits from the natural variation among different organisms , Speciation - A process typically caused by the genetic isolation from a main population resulting in a new genetically distinct species, Natural Selection - A process in which individuals that have certain inherited traits tend to survive and reproduce at higher rates than other individuals because of those traits, Vesigial Structures - A structure that is present in an organism but no longer serves its original purpose, Survival of the Fittest - Process by which individuals that are better suited to their environment survive and reproduce the most successfully; also called natural selection, Adaptation - A characteristic that improves and individual's ability to survive and reproduce in a particular environment , Embryology - Similarity in the appearance of embryos from different animal species that supports the idea of common ancestor , Fossil Evidence - The fossil record provides snapshots of the past that, when assembled, illustrate a panorama of evolutionary change over the past 4 billion years , Camouflage  - Many animals have evolved to exhibit some form of camouflage, which is an adaptation that allows animals to blend in with certain aspects of their environment , Law of Superposition - The top layer and its fossils is the youngest and the bottom rock layer is the oldest, Extinction - When a species is no longer found on Earth currently ,

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