Listening – Magoosh TOEFL Lecture #3 Script Male Professor All organisms need energy, right? All living things have to consume energy-dense, biological materials…otherwise known as foods, heh… in order to function, grow, and maintain healthy cells. The food that is ingested by the organism has to be DIGESTED in order to be absorbed and effectively used for, uh, for whatever bodily processes needed. So let’s compare digestion in humans and something pretty far removed—single-celled organisms called protozoa. Both protozoa and humans ingest substantial amounts of food material and break it down in THREE PARTS of digestion. I mean, they share the same basic phases. The three parts of digestion are mechanical, chemical, and, uh, absorption. First, let’s—let’s take a look at the three different parts of digestion that are common to both protozoa and humans. For many organisms, MECHANICAL DIGESTION involves the breakdown of large food particles into more… I mean