TOEFL Listening: ETS-TOEFL听力机经 - JT30A1Z3R313Z1E4P$

According to the lecture, which of the following describes digestion in BOTH humans and protozoa? A. Nourishment is ingested and separated into its various components. B. A path in the organism's body pushes food through the digestive system. C. Chemical digestion is carried out in multiple biological structures within the organism. D. Enzymes draw nutrients from food material during chemical digestion.