20. check all the properties that apply to a base such as soapy water or bleach or ca(oh)2. *
3 points
taste bitter
taste salty
taste sour
have low ph's - less than 7
have high ph's - more than 7
feel slippery
react with metals to form hydrogen gas

the temperature of the gas, in k, not celsius.

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.