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
Answer:
Explanation:
Oof I don’t really know that one maybe someone els
Starry? Like what questions are you being asked
The banks <u>don't</u><u> </u><u>open</u><u> </u> on Sundays.....
What time <u>does</u><u> </u><u>the</u><u> </u><u>train</u><u> </u><u>leave</u><u> </u>.......