An experiment is performed to test the effect of three different types of water on the growth of a plant. the test is done by using tap water, distilled water, and carbonated water. choose the statement below that describes the tap water in this experiment. the tap water is a controlled variable for all plants. the tap water is the control group for comparison. tap water is the only test condition that will cause measurable changes in the dependent variable, plant growth. tap water is one of the three test conditions of the independent variable, the type of water.

The correct statement is that tap water is one of the three test conditions of the independent variable, the type of water.  

In the given question, the test is done at three levels, that is, by using tap water, distilled water, and carbonated water. In this experiment, the testing of the effect of the types of water on the growth of a plant is done. Hence, the independent variable is the water type. The dependent variable in the given case is the growth of a plant that can be determined via the height.  

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.