Question

1. which question would be least helpful to ask after interpreting the data in figure 1?

why were the carbon dioxide rates always higher than the other two greenhouse gases?
what major events happened in the year 1900?
are the nitrous oxide rates going to level out?
what major events happened in the year 700?

Explanation:

When interpreting data about greenhouse - gas rates, questions about events in years 1900 and 700 are least relevant as they do not directly relate to the greenhouse - gas data. However, year 700 is far removed from the context of modern greenhouse - gas studies. Questions about the gas rates themselves (like CO2 rates being higher or nitrous oxide rates leveling out) are more relevant to the data.

Answer:

What major events happened in the year 700?