Which statement below is a valid scientific hypothesis?
Which statement below is a valid scientific hypothesis?
| Fish require oxygen for aerobic respiration. |
| Blake Sheldon was a better coach on America Idol than Pharrell Williams. |
| The Paleo diet is better than the Atkins diet. |
| Threatened & endangered wildlife species should be protected from harm. |
| Helping someone to change a flat tire is the right thing to do. |
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