Growing radishes

This task is about your understanding of carrying out a fair test.
Sarah carried out an investigation. She got 6 radish plants, 2 containers, and some soil from the garden centre. She then planted 3 radish plants into each container and put one container in the shade and one container in the sun. Sarah watered her plants every day for a week.

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a) What was the aim of her investigation?

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b) What are three important things that Sarah should keep the same in her investigation?
 

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c) What should Sarah measure to find an answer to her investigation?

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d)  Why did Sarah plant three radish plants in each container?
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