Sally has collected a sample of dirt from a riverbank and wants to analyze it. First she decides to find the mass of the sample. What tool should she use?

cardiovascular system

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chordata is the answer

option a and d is the correct answer

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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.