Question

lucia had six air plants on her desk that were not growing. once a week, she soaked the air plants in water. but she suspected that they needed more water. she wondered if spraying the air plants with water every day in addition to soaking them would help them grow. lucia measured the initial weight of all six air plants. then, for the next month, she continued to soak all of the air plants once a week. she also sprayed three of the plants every day. at the end of the month, lucia measured the weights of the plants again. in this experiment, which were part of a control group? the plants that were only soaked in water the plants that were soaked in water and sprayed

Explanation:

In an experiment, the control group is not exposed to the variable being tested. Here, the variable is daily spraying. The plants that are only soaked (not sprayed daily) serve as the control to compare the effect of daily - spraying on plant growth.

Answer:

the plants that were only soaked in water