Which of the following is required for a reaction to occur? a. energy
b. collisions
c. activation energy
d. all of the above

the atomic mass is the bottom number on the element.

-steel jelly

what does the table look like

the maximum mass of nh3 is nh3 in grams

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.