1. . Are these physical or chemical changes? a) slicing cheese b) acid reacting with baking soda to make carbon dioxide
c) emptying a gas cylinder of air
d) cooking eggs​

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

yes

ya te ayud espera

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.