How Did Charles Elton Contribute To The Environment

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Charles Elton:
In his book: “Animal Ecology and Evolution” he wrote: “In periods of stress it is a common thing for animals to change their habitats and usually this change involves migration.” He also wrote: “we are face to face with a process which may be called the selection of the environment by the animal, as opposed to the natural selection of the animal by the environment.”
Elton also figured out that a large number of plants is needed to supply a smaller number of plant eating animals. Such animals, in turn, provide food for an even smaller number of meat-eating creatures. He called this natural system of food relationships a “pyramid of numbers.” His contributions have made things better because we can use this “pyramid of numbers”
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