Poaceae have hollow stems called culms plugged at intervals by solid leaf-bearing nodes. Grass leaves are nearly always alternate and distichous (in one plane), and have parallel veins. Each leaf is differentiated into a lower sheath hugging the stem and a blade with entire (i.e., smooth) margins.oaceae have hollow stems called culms plugged at intervals by solid leaf-bearing nodes. Grass leaves are nearly always alternate and distichous (in one plane), and have parallel veins. Each leaf is differentiated into a lower sheath hugging the stem and a blade with entire (i.e., smooth) margins.
Air conditioning system components consisting of Condensing Unit, Evaporator Coil, Refrigerant line. How air conditioning works is kind of a mystery to many of us. Furnaces are easy to understand, they heat air and blow it around your home in ductwork.
Report Abuse. Some air conditioners contain freon, carbon dioxide or ammonia. All are bad for the environment (CO2 isn't as bad as people think it is, people make CO2 when they breathe). But these chemicals stay inside of the air conditioner, these gases are responsible for making it cold.ir conditioners do not normally make a reaction that involves releasing CO2 (except when the fail and burn up, I suppose).