16. What is the scientist doing when she is putting something into use based from the outcome of the experiment?
A. Applying
B. Observing
C. Experimenting
D. Communicating.

17. Xarah wish to do a simple experiment in studying the growth of the fish. She has two set ups. She has the same size and kind of fish. Which statement is true?
A. Her independent variable is the size of fish.
B. Her dependent variables are the plants and water.
C. She will need the same amount of water,same kind of fish and different amount of food.
D. The experiment does not matter as long as she
has the fish, water and aquatic plants.

18. Shannon wants to discover which liquid dissolves
salt faster. Which idea will make her experiment a success?
A. Tell her to do different numbers of stirring.
B. Tell her to use more than one independent variable.
C. Advise her to use the same amount of cold and hot water for each set-up.
D. Advise her to use an expensive brand of water for the experiment.

19. Why is a scientific method an important process in making an experiment?
A. It takes more work but is worth it.
B. It helps the experiment to take longer and better.
C. It ensures that the results can be trusted and repeated​.
D.It ensures that the people doing the experiment are scientific.