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Three wax palm trees are kept at different humidity levels inside of a greenhouse for 12 weeks. One tree is left outside in normal conditions. The height of the tree is measured once a week. Which of the
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Three wax palm trees are kept at different humidity levels inside of a greenhouse for 12 weeks. One tree is left outside in normal conditions. The height of the tree is measured once a week. Which of the following is your controlled variable?

User Kowlown
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The tree left in normal conditions, since you can use that to see how the humidity affected the others, whether they allowed them to grow better or worse.
User Wiingaard
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