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Sagot :
Answer:
A - The type of plants
Explanation:
A - Keeping the same type of plant allows no other variables like:
different rates of growth, temperature, etc. to affect one plant more than another.
B - The height of the plant is the variable you're trying to see the out come for, not to change.
C - The location IS the thing you are trying to change, so you wouldn't want it to stay the same.
D - Since B and C are wrong, it cannot be all.
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