Is - two billion dollars is a unit, one unit so it is singular and you use the singular verb
think - scientists is a plural, therefore, you must use the plural verb form of think
The symbolic meaning of gold in the poem is best described by option C. The wonderful things in life that do not last.
In the poem, gold is used to describe the transition of nature from one state to another. Everything that is colored gold does not last long, that is why it is said that nothing gold can stay. Here, we get the idea that we should get the most of these valuable "things" before they are no longer there.
Explanation:
i think the writing is backwards but yea
