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11 Cards in this Set

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remains of organisms preserved in the earth
Fossil
organisms made up of a single cell
Unicellular organism
organism made up of many cells
multicellualr organism
huge numbers of species teh have died or become extinct in a very short time
mass extinction
the process through which species change overtime
evolution
members of a species that are best suited to their environment that can survive and reproduce at a higher rate that other members of their species
natural selection
an inherited trait that gives an ogranism an advantage in its particular environment
adaption
the evolution of new species from an existing species
specialization
are physical structures that were fully developed and functional in an earlier group of organisms but are reduced and unused in later species
vestigial organs
an early form of an organism from which later forms descend
ancestor
a segment of DNA that relates to a specific trait or function of an organism
gene