Before you begin your lab, write a hypothesis that reflects how you think temperature of the water will affect the reaction rates. Record your hypothesis as an "if, then" statement.

The temperature of the water has important  role in the  reaction rates.

A hypothesis is a prediction made before any experiment or study that shows  relationship between a dependent variable and independent variable.

A hypothesis before begin a lab is "If the temperature of water will rise, then the rate of reaction will be high".

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.