In the experiment with plants being grown at different temperatures to see how it will affect a plant's growth, the control group is the plant being grown at room temperature. The experimental group includes the three plants being grown at temperatures greater than room temperature.
The best answer to fill in the blank would be B) Small intestine or the second option.
The way the yeast takes in the food for yeast?
Sorry if I'm wrong! I don't really know biology. I just wanted to try to help.
It would be the 3rd option: Reaction to a stimulus helps maintain homeostasis.
Do you need an explanation?