The graph shows levels of carbon dioxide in Earth's atmosphere over the last 400,000 years. Which conclusion can you draw from the information shown in the graph?
O Carbon dioxide levels in the past have been as high as they are now.
O Carbon dioxide levels are currently much lower than normal.
O Carbon dioxide levels are always about the same.
O Carbon dioxide levels are currently higher than they have ever been.

d

Explanation:

*tilts head* sounds more like a statement

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.