C A controlled experiment is an experiment in which only one variable is changed at a time Why is it important to do a controlled experiment in order to determine how a
vanable, such as water, light, or temperature, affects seed germination rates?

the  frequency of a wave represents  the number of wavelengths that pass a specific point per second. the unit for  frequency  is hertz (hz).

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sand 60

clay 10

silt 30

sandy loam should be dominated by the sand. as the amount of sand increased, the amount of slit needed to anchor the plants' roots to the sand will also be increased. even though the amount is very little, 10% part of clay is still necessary for proper oxidation.

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explanation:

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