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Natural Selection

Across
the process whereby groups from the same common ancestor evolve and accumulate differences, resulting in the formation of new species.
the reduced genetic diversity which results when a population is descended from a small number of colonizing ancestors.
the branch of science concerned with fossil animals and plants.
a term that describes the survival and reproductive output of an individual in a population relative to other members of the population.
the intentional breeding of plants or animals.
comparable in certain respects, typically in a way which makes clearer the nature of the things compared.
a layer or a series of layers of rock in the ground.
the state of having the same or similar relation, relative position, or structure.
Down
the change in allele frequencies that occurs over time within a population.
a term that refers to a population of animals, plants, or other organisms that are separated from exchanging genetic material with other organisms of the same species.
the process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth.
(of a plant or animal) native and restricted to a certain place.
the process by which a species becomes fitted to its environment; it is the result of natural selection's acting upon heritable variation over several generations.
the branch of biology that deals with the geographical distribution of plants and animals.
a hypothetical supercontinent that included all current land masses, believed to have been in existence before the continents broke apart during the Triassic and Jurassic Periods.
the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.