Question

A new species x is introduced to the forest how is it likely to affect the old species

Answer 1

since it will be an Invader species, it will increase its population without any check because no natural predator is present here . ALthough it will compete for old species for food and shelter...
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Answer 2

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Introduced of New species can have a significant impact on Endemic Species. This is because the new species may prey on complete for resources with the existing species.