In a balanced ecosystem, the number of deer would be

That depends on the amount of other species in the ecosystem, as well as how healthy it is.

That also depends on if the ecosystem has meet its caring limit because then the population of dear would start to decline

Explanation:

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answer: collecting information/data

reason: the student is going around and asking people questions to collect data

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the question isn't complete here so i can't right an answer '_'