A basketball is left on the playground overnight. It initially has a volume of 6.42 liters at a temperature 32°C. What is its volume if the temperature
drops to 18°C overnight?

the answer is 75.0%.

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.