These 10 animal facts will amaze you. The face of farming and agriculture has changed drastically over the past 100 years. At the beginning of the 20th century, over 70% of the population of the United States lived and worked on farms, but by 2008, the figure had dropped to less that 3%.
During this process, glucose from food is broken down into carbon dioxide and water, and energy is released. The process of releasing energy from food is called respiration, or cellular respiration as it is a series of steps that take place within living cells. It is important to not confuse respiration, or oxidizing glucose, with breathing.
The three key steps of aerobic respiration are glycolysis where the sugar glucose is broken down, the Kreb's cycle where products from glycolysis are converted to other molecules and cellular energy and the electron-transport chain where molecules from the Kreb's cycle split apart to fuel the cell.arbon Dioxide. Carbon dioxide is a waste product of aerobic respiration. The first carbon dioxide production occurs when the products created from glucose during glycolysis are converted into the initial molecule needed to begin the Kreb's cycle.