Science

Which of the following factors does not vary between a fast-following river and a pond that receives no water input?

a. oxygen levels
b. salt concentration***
c. temperature
d. fish species

Plzzz help me:)

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  1. NVM, i'm done!

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    posted by Labbayk
  2. what was the answer?

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  3. B, salt concentration

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    posted by Carolyn
  4. The correct answer is B

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    posted by Mikle

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