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?

A. The control group should have plants growing at higher oxygen levels.

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

C. The control group should have plants growing in different amounts of water.

D. The control group should have plants growing at normal carbon dioxide level.

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. The control group in this experiment should be be treated as :

D. The control group should have plants growing at normal carbon dioxide level.

Explanation:

As the level of carbon dioxide in the atmosphere increases, it's boosting the growth of poison ivy plants, two recent studies show.
These elevated carbon dioxide levels are creating bigger, stronger poison ivy plants that produce more urushiol, the oil that causes the allergic reaction and miserable poison ivy rash.
The poison ivy rash can also raise your risk of getting a potentially serious skin infection from scratching your skin.
About 80% of people are sensitive to the plant meaning they may develop a poison ivy rash if they come in contact with the plant.
Scientists showed that elevated carbon dioxide boosts the growth of poison ivy and results in the production of a more powerful form of the urushiol.
The control group should have plants growing at normal carbon dioxide level. Scientists would grow plants at a normal carbon dioxide level to see if increasing carbon dioxide has an effect on the experimental group.