Natural Selection

Natural Selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in heritable traits of a population over time.

Adaptation- heritable characteristic that increases an organism's ability to survive and reproduce in an environment

Fitness- how well an organism can survive and reproduce in its environment

Survival of the Fittest- difference in rates of survival and reproduction


Fossils- the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock


Biogeography- the study of past and present distribution of organisms

Vestigial structure- structure that is inherited from ancestors but has lost much or all of its original function

Analougus structures-body parts that share a common function, but not structure


Created with images by Maurizio Costanzo - mavik2007 - "Ecuador, Galapagos. Marine iguana - 1992" • TheoJunior - "mermaid fossil"

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