Determine which of the following observations are testable. for those that are testable: determine if the observation is qualitative or quantitative write a hypothesis and null hypothesis what would be your experimental approach?
what are the dependent and independent variables? what are your controls - both positive and negative? how will you collect your data? how will you present your data (charts, graphs, types)? how will you analyze your data?
observations
(a) a plant grows three inches faster per day when placed on a window sill than it does when placed on a on a coffee table in the middle of the living room.

explanation:

on disadvantage of hydroelectric power is the cost. another disadvantage of using hydroelectric power is finding a water source powerful enough to harvest hydroelectric power.

answer: b: experiments that showed that all cells are similar in how they metabolize and in their composition

explanation:

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it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.