What is the differecn between Clo2 And Clo-2

- ClO₂: it is chlorine dioxide.

- ClO₂⁻: it is the chlorite ion.

Explanation:

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In this case, since Cl stands for chlorine and O stands for oxygen, being the first compound an oxide and the second one an ion, we can reason:

- ClO₂: it is chlorine dioxide and as its name indicates it, it is an oxide with neutral charge, actually, a molecular compound formed by one chlorine atom and two oxygen atoms.

- ClO₂⁻: it is the chlorite ion in which chlorine has +3 as the oxidation state and therefore it is not neutral but negative as it is ready to bond with a positive ion (cation).

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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.