The neuroendocrine system combines brain actions and and other bodily functions. In the brain, the hypothalamus maintains the balance (homoestasis) which affects other functions of the body such as metabolism, regulating reproduction, utilization of energy, drinking and eating behavior, blood pressure and osmolarity.
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Such unequal distribution of resources was commonly related to land for agriculture, necessary for population growth.
I think it would be to exchange gases. When you think about it, plants in the past were always underwater. They didn't have any air. Now, they are on land and need to be able to exchange gases from the leaves to the roots.
Metamorphism means alteration of the composition or structure of a rock by heat, pressure, or other natural agency