Question

1. the hale - bopp comet was close enough to earth in 1997 that people could see it. the diagram below shows the kind of data scientists collected on hale - bopp and was used to develop theories about comets. why did scientists most likely use the method in the diagram to study the comet instead of performing experiments? a. it is impossible to experiment with actual comets. b. observations are more accurate than experiments. c. it is less expensive to observe than to perform experiments. d. conclusions cannot be drawn from completed experiments. 10. ashley is doing an experiment testing different brands of laundry detergent and their effectiveness of removing stains. which of the following would be the independent variable? a. the amount of stains removed b. the type of water used c. the size of the original stain d. the brand of laundry detergent 11. a scientific method is a way to investigate a scientific problem. although the order of steps can vary, the tasks performed during each step often stay the same. during which step of the scientific method would a scientist collect data? a. developing a plan b. forming a hypothesis c. testing the hypothesis d. communicating the results

Explanation:

• Question 9: Comets are far - away celestial objects. It's not feasible to conduct experiments on them due to their nature and distance. Observing is the practical method.
• Question 10: In an experiment, the independent variable is the factor that is changed or manipulated. Here, the brand of laundry detergent is being changed to test its effect.
• Question 11: During the process of testing the hypothesis, a scientist conducts experiments or makes observations to collect data.

Answer:

1. A. It is impossible to experiment with actual comets.
2. D. The brand of laundry detergent
3. C. Testing the hypothesis