A class of eight students measured the population of water fleas living
at the edge of a large pond. This is the method each student used. 1. Put
some pond water in a white tray.2.Take a pond net and scoop at the edge
of the pond a few times.3.Empty the pond net into the water in the
tray.4.Count the number of water fleas in the tray. The photograph below
shows a student working. The students did not control some variables. Give
two variables the students should have controlled to make this a valid
method.
Answers: 2
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The source of energy shown in the image is (renewable, non renewable, polluting) a drawback of building a dam is that (it will destroy ecosystems, it requires fossil fuels, it won’t be useful for irrigation)
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A class of eight students measured the population of water fleas living
at the edge of a large pond...
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