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Miller & Levine Chapter 16.3 (Darwin Presents His Case)
Terms in this set (9)
Any heritable characteristic that increases an organism's ability to survive and reproduce in its environment
Describes how well an organism can survive and reproduce in its environment
The process by which organisms with variations most suited to their local environment survive and leave more offspring
Under what conditions does natural selection occur?
Natural selection occurs in any situation in which more individuals are born than can survive (the struggle for existence), there is natural heritable variation (variation and adaptation), and there is variable fitness among individuals (survival of the fittest)
What does Darwin's mechanism for evolution suggest about living and extinct species?
According to the principle of common descent, all species - living and extinct - are descended from ancient common ancestors
Struggle for existence
organisms compete for limited resources, endure disease, predator-prey, extreme events such as drought...
within a species every individual is different due to sexual reproduction & mutations.
Each generation produces more offspring than will likely survive.
all species - living and extinct - are descended from ancient common ancestor.
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