The class of molecules is sugars
In the pulmonary circulation, deoxygenated blood leaves the right section of the heart through the pulmonary artery, enters the lungs and oxygenated blood comes through the pulmonary veins. The blood then moves to the left atrium of the heart.
C. that should help you :)
E. Decreasing greenhouse gas concentrations is not a consequence of urbanization.
Greenhouse gases are actually increasing.
I hope that helps ya!!