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b. 100000 & 1000000 & 1000000000

c. 600 & 10000000 &200 & 540

Explanation:

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There are four main types of species interactions that occur between organisms in an ecosystem: Predation, parasitism and herbivory - In these interactions, one organism benefits while the other is negatively affected. * Competition - Both organisms are negatively affected in some way due to their interactions.

Explanation:

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