fossil, the remains of parts of an organism such as bones, teeth, feathers., evolution, a change in the allele frequencies in a population over time, Extinction, The disappearance of a species, common ancestor, the organism that came before two or more organisms (descendents), population, a group of the same organism in a given area, Charles Darwin, a naturalist who contributed to the theory of evolution, Mass Extinction, A period of time when more than 50% of all existing species died out globally., Deforestation, Cutting down trees in large number which destroys habitat., Climate Change, The environment is changing too quickly for organisms to pass on favourable genes allowing the population to adapt to the new environmental conditions., Introduced Species, Plants or animals that are not native to an area and are better able to hunt or find shelter than the native species., Hunting, A human activity which greatly increases the death rate of species., Zoo, A collection of animals which can be used for captive breeding programs and then reintroduced to the wild., Habitat protection, fencing off existing areas to protect the species that live there, Relative Dating, Digging into the earth, the fossils that are found closer to the surface are more recent, Absolute dating, detecting ratios of different isotopes (e.g. Carbon-14) of the same element in the fossil.

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