Write chemical formulae and arrange these salts under 2 headings :
“Soluble” and “Insoluble": -

a)Sodium chloride
b)Silver nitrate
c)Silver chloride
d)Lead iodide
e)Ammonium sulphate
f)Lithium carbonate
g)Barium sulphate
h)Barium chloride

a boiling water reactor does not boil the water. a pressurized water reactor boils the water faster. a pressurized water reactor is heated directly by the core. a pressurized water reactor does not use fission.

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.