1. You put an unknown substance into a graduated cylinder filled with 60 ml of water. After the substance is submerged, the water level rises to 90 ml, Then,
you measure the mass of your substance. The mass is 25 g. What is the density
of the substance?

17g 18ml 170ml

Explanation:

in chemistry, a solution’s concentration is how much of a dissolvable substance, known as a solute, is mixed with another substance, called the solvent. the standard formula is c = m/v, where c is the concentration, m is the mass of the solute dissolved, and v is the total volume

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.