All animals need to eat blank to get blank to live in order to use this food they have to break it down in a process called blank and so all animals have a group connected organs the digestive blank in humans the process of digestion begins in the blank where food is blank into small pieces by the teeth the blank helps by moving the pieces around these pieces are covered by blank or spit the saliva makes the food slippery so that is easier to blank also helps to break down the food once the food is swallowed it passes through the blank