Question

A scientist wants to know if humidity affects the growth of wax palm trees. 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 trees are measured once a week and recorded in a data table. Which of the trees is the control group

Answer 1

The wax palm tree placed in the normal condition is the control group because it will be used compared to the trees with humidity levels the scientist choose.