Which of the following is a substance? A. air
B. alloy
C. soil
D. seawater
E. carbon

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Ascientist conducted an experiment and discovered that certain plants grow faster when given a particular amount of fertilizer. anouther scientist conducted the same experiment and got similar results. which concept does this best illustrate? a) repetition b) replication c) precision d) validity

The plant food contains nh4)3po4 what tests would you run to verify the presence of the nh4 ion and the po4 ion