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2 votes
Which change would create a new ecosystem? (1 point)

O a lake freezing over
O an introduced species
O a dam flooding a valley
O a yearly migration

1 Answer

9 votes

Answer:

a dam flooding a valley

Step-by-step explanation:

It would be a dam flooding a valley because in a new ecosystem there would then be a increased load of phosphorus and nitrogen and increased algae growth.

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