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irakobra [83]
3 years ago
5

HELP PLEASE!! HURRY VERY VERY EASY!! JUST LET ME KNOW WHICH LETTER I DONT NEED AN EXPLANATION! ILL GIVE BRAINLIEST! PLEASE FAST!

Biology
2 answers:
vampirchik [111]3 years ago
5 0

Answer:

B

Explanation:

stich3 [128]3 years ago
3 0

Answer:it’s b

Explanation:

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The factors which remained constant are as follows -

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  2. amount of substances used
  3. number of trials

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Some factors with in the experiments remained constant from the point of starting of the experiment to its end. While some factors were varied to study its impact on the experiment rate of progression or on the final product formed. Thus , out of the following given factors, the ones that remained constant are -

  1. material used as the membrane
  2. amount of substances used
  3. number of trials

The factors which have shown variation are as follows -

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