The picture below shows an experiment in which a student mixed two clear liquids together. The student can conclude that a chemical change occurred because —
A. О a solid formed when the two liquids were mixed.
В.
there was no temperature change during the experiment.
С.
there was no change in mass during the experiment.
D
one substance was more dense than the other.

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confused

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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.