The graph shows data from ice cores. What has happened to carbon dioxide levels over time? A. They have increased dramatically recently.

B. They have remained flat and steady.

C. They have decreased dramatically recently.

D. They have gone up and down with no general trend.

A they have increased dramatically

Explanation:

As the time progresses it was relatively stable until about 1800, and then the atmospheric CO2 increased dramatically

i think that d. wind is the answer.   i missed the question when i answered a. currents.

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.