Answer:
<em>Scientists should repeat quantitative experiments so they are 100% percent confident in their results. Without repeating the experiments, you could have a problem, and not realize you have a problem, because you didn't repeat your experiment.</em>
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<em>:))</em>
Multiple choices :
A. test for chemicals that might poison fish and cause algae to grow
B measure the dissolved oxygen content in pond-water samples
C look for sources of pollution that may be affecting the pond
D measure the amount of light at various levels in the pond
Answer;
D. measure the amount of light at various levels in the pond
Fish in the pond feeds on the algae that grows in the pod.
Therefore; death of fish in the pond caused a large increase in algae populations.
Measuring the amount of light in the pond would not tell the student what caused the death of the fish in the pond.
I think the answer is Calcium. Hope this helps.
i think that is is gravity becasue gravity pulls the planets
