How do you know a physical change has occurred when evaporating water produces gaseous water?

A
A chemical change has resulted in a new substance.

B
A chemical change has resulted in a change of state.

C
A physical change has resulted in a phase change, not a change in composition.

what is the average time it took the car to travel 0.25 meters?

⇒ 2.23 seconds

what is the average time it took the car to travel 0.50 meters?

⇒ 3.13 seconds

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.