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PLEASE HELP ME!!!!!!!!!!!! Poison ivy is a weed that produces an oil which causes skin rashes. Scientists want to perform an experiment to see if poison ivy grows taller when exposed to more carbon dioxide. How should the control group in this experiment be treated? Choose 1 answer: Choose 1 answer: (Choice A) A The control group should have plants growing at normal carbon dioxide level. (Choice B) B The control group should have plants growing at different carbon dioxide levels. (Choice C) C The control group should have plants growing at higher oxygen levels. (Choice D) D The control group should have plants growing in different amounts of water.

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Answer: B. The control group should have plants growing at different carbon dioxide levels

Step-by-step explanation:

If it is being tested in different carbon dioxide levels, the control group would have enough data to determine which carbon dioxide level(s) is more effective.

Answer:

A. The control group should have plants growing at normal carbon dioxide levels.

Step-by-step explanation:

The control group is in the normal state - nothing about it has been changed. This is your baseline.

The other group or groups change only one condition or state- for example the level of carbon dioxide. This condition or state is the variable.

The variable conditions or states are compared to the control group.

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