Some persons say that love makes the world _____1_____. Others of a less romantic and more ____2____ say that it isn’t love; it’s money. But the truth is that it is energy that makes the world go round. Energy is the currency of the ______3______ and life becomes possible only when food is _______4______ energy, which in turn is used to seek more food to grow, ______5_______. On this cycle all life depends.