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8 July, 08:29

Agricultural scientists are trying a new man-made vitamin on tomato plants to make them bigger and redder. They are putting the vitamin in the soil of a group of plants, and are also observing a group of plants that have received nothing other than regular water. This second group is the:

variable group.

experimental group.

placebo group.

control group

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  1. 8 July, 08:33
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    The second group is the:

    Option D. control group
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