41.   The second factor is that the plant has to have stored enough carbohydrates to produce the energy necessary to create a flower.

42.   Their approach apparently means that oil, gas and coal companies should be free to produce energy anywhere they can find it.

43.   They still believe that oil, gas and coal companies should be free to produce energy anywhere they can find it.

44.   This process produces energy, leaving water as the only waste product.

45.   Those muscles utilize oxygen for a chemical reaction to produce energy.

46.   To contract or carry weight, muscles produce energy through metabolism.

47.   Wind energy in new windmills costs about the same as coal produced energy.

48.   A fuel cell produces energy from a chemical reaction when hydrogen is combined with oxygen.

49.   And the industry is headed to fuel cells, which produce energy from a chemical reaction between hydrogen and oxygen.

50.   Biomass systems make use of plant and other organic material to produce energy.