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german
3 years ago
10

Help ... ... ...... .......... .................... ........................

Biology
1 answer:
polet [3.4K]3 years ago
4 0

Answer:

D.

Explanation:

She's trying to find the affect different shapes have on the distance the plane flies, not the affect different types of paper have on distance. If she were to use different paper for each plane she'd be testing two variables instead of one.

hope this helps :)

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