NEED ANSWER ASAP!!! 15 POINTS!!!! A student investigating how experimental conditions affect plant growth grows two identical plants, one indoors and one outdoors. Three month later the plant grown indoors

NEED ANSWER ASAP!!!

15 POINTS!!!!

A student investigating how experimental conditions affect plant growth grows two identical plants, one indoors and one outdoors. Three month later the plant grown indoors was 6 cm tall, and the plant grown outdoors was 18cm tall.

Part A: Identity one variable, other than light, that the student should have controlled in this experiment.

Part B: Explain why variables should be controlled in experiments

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