Question

A) humans breathe out carbon dioxide, and plants absorb carbon dioxide. when considering the balance of carbon dioxide in the atmosphere, do you think human breathing is a factor that causes an imbalance in the carbon cycle? explain.

Answer 1

No, If anything it would cause a balance in the carbon system because if humans breathe out carbon dioxide and plants absorb that carbon dioxide there wouldn't be any imbalance.

Answer 2

No, this does not portray any imbalances with the carbon cycle.
Typically, the ozone layer absorbs the unhealthy types of ultraviolet rays, so it's got us as covered as Allstate at this point (Pun intended)
 Plants absorb the carbon dioxide, which is their breathing source.
Plants do release oxygen, which helps us, the people breathe.
Now, we are the ones who filter out the carbon, and the plants renew their energy from us mostly. 
Even cars sometimes give plants energy, depending on the type of excesses they give out.
So in conclusion, everything is figured out, and there are no imbalances with the carbon cycle.

Hope it helps!