4. an animal that relies on a digestive tract for digestion breaks down food bya. both intracellular and extracellular digestion. b. extracellular digestion onlyc. neither intracellular nor extracellular digestion. d. intracellular digestion only

The answer is b. An animal that relies on the digestive tract for digestion breaks down food via extracellular digestion. The digestive tract uses mechanical and chemical processes to digest the food. Extracellular digestion is a type of digestion that happens in an opening as part of a digestive system where the nutrients produced from digestion is transferred to the blood or other body fluids. The digestive tract serve as the opening.

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