A school playground is 100 metres long and 100 metres
wide. It has an area of
10,000 m2. One day 10 mm of
rain falls of the playground.
That is equal to 100,000 litres
of water- enough to fill four
large tankers! Write a short
description of what might
happen to all that water.​

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the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.