Biology quiz review

Once a hypothesis is proven, it never changes.

A biology student completes a science fair project. The purpose of the project was to study the effects of soil pH on a specific type of tomato plant. She divided forty plants into four groups of ten using one group as a control. The results she recorded showed more surviving plants in the soil with a pH of 7. What does this indicate?

Once a hypothesis has been proven, it becomes a theory.

Scientists often form hypothesis based on particular observations. Which of the following is NOT true of a good hypothesis?