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Essentials of Biology

Across
English Naturalist, best known for theories of Evolution.
Division of rock layers.
Reproductive success of an individual.
Down
Appearance of new forms as replacing old forms due to___.
any alteration in the structure or function of an organism or any of its parts that results from natural selection and by which the organism becomes better fitted to survive and multiply in its environment.
the process by which different kinds of living organisms are thought to have developed and diversified from earlier forms.
Founded paleontology.
process whereby organisms better adapted to their environment tend to survive and produce more offspring.
Royal Navy ship that Darwin used.