Which of the following correctly explains the meaning of the statement "the relative humidity in phoenix is 10 percent today" a. ten percent of the air in phoenix is water vapor. b. the air holds 10 percent of the water that is available in phoenix. c. the air in phoenix holds 10 percent of the water that it could hold. d. ten percent of the water in the air in phoenix is contributing to the humidity.

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.