Science homework I need a hypothesis for each problem.

problem// Do plants need water to grow?

answer for a hypothesis

problem// Does exercising increase heart rate?

Answer for a hypothesis

problem// Does eating breakfast help you to do better in school?

Answer for a hypothesis

problem// does water filtrate through gravel faster than sandy soil?

answer for a hypothesis

problem// does a diet in vitamin c help a person resist the common cold

answer for a hypothesis (this isn't about the 12 angry men book)