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Defend Earth from alien invaders
the formation of new species as a result of evolution
the study of the structure and form of an organism
biological species concept
the concept that a species is a population of organisms that can interbreed but cannot breed with other populations
the physical separation of populations due to geographic barriers that prevent interbreeding
happens when species arise as a result of geographic isolation; means "different homelands"
the inability of members of a population to successfully interbreed with members of another population of the same or a related species
also called premating isolation, occurs before fertilization
also called postmating isolation, occurs after fertilization
occurs when two subpopulations become reproductively isolated within the same geographic area; proposed by Darwin
the idea thta speciation ocurs at a regular, gradual rate
relative stability for long periods of time interspersed with much shorter periods during when many species become extinct and new species emerge; "punctuated" refers to sudden, rapid change and "equilibrium" refers to periods of little change
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