$\"\"$

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Observe the graphs of populations of two species :

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The graphs are like a peridic functions.

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The graph of species 1 and species 2 varies like $\"\"$ or $\"\"$ functions.

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Species 1:

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Popultion is increases at $\"\"$ .

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The populations of species 1 is varies from : $\"\"$ to $\"\"$ .

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The amplitude is $\"\"$ .

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The period of the function is $\"\"$ .

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The initial population is $\"\"$ .

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$\"\"$ .

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Species 2:

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Popultion is increases at $\"\"$ .

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The populations of species 2 is varies from : $\"\"$ to $\"\"$ .

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The amplitude is $\"\"$ .

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The period of the function is $\"\"$ .

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The initial population is $\"\"$ .

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$\"\"$ .