Which is represented by the arrow labeled 4 in the diagram? a. water is absorbing heat energy and changing from a liquid to a gas. b. water is releasing heat energy and changing from a gas to a liquid. c. water is running and collecting along the surface. d. water is being absorbed into the ground.

Why is it important for scientists to review and repeat the work of other scientists? 1.a scientific theory must be tested three times before it is proven. 2.the scientific method only applies to repeated experiments. 3.an experiment may have had errors that the scientists didn't recognize. 4.the results of individual scientists may be influenced by bias. 5.an experiment must be performed twice before the data can be analyzed.