The answer is A. The vascular system, filled with vascular tissue, are the crucial conduits through which water and nutrients flow through plants. Without them plants are limited to being a few inches (centimeters) tall. Leaves that get sunlight have nothing to do with a plants height.
Transgenic.
this is also sometimes called gene targeting.
D) disease has nothing to do with climate change
The basic idea is that the solar energy passes through a layer of glazed glass where it is absorbed by the underlying material. the solar energy excites the molecules in the underlying material resulting in heat. the glazing of the glass prevents the heat from escaping. thereby effectively capturing the heat.