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Darwin's Principles
Evolution
6
Biology
9th Grade
03/24/2010

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Term
overpopulation
Definition
most species produce more offspring than are needed to maintain the population
Term
competition
Definition
living space and food are limited, so offspring must compete with-in their own species and with other speicies
Term
variation
Definition
characteristics of individuals in any species are not exactly alike
differ in shape of body, size, strength, speed, and resistance
Term
adaptations
Definition
better able to survival due to variation, ability to adapt to survive or reproduce
adaptation = any inherited trait that improves an organisms chance of survival or reproduction
Term
natural selection
Definition
environment selects plants and animals with desirable traits to be parents of the next generation
individuals with variation are better able to adapt and survive and reproduce in greater numbers
Term
speciation
Definition
formation of a new species
favorable adaptations accumulate, and unfavorable disappear
when accumulated changes become so great that we get a new species
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