Intracellular digestion refers to the digestion of food ingested by single-celled animals by various hydrolytic enzymes. According to the above definitions, Which of the following belong to intracellular digestion:. ['Poultry digests in the stomach after eating food.', 'Paramecium living in freshwater devours Bacillus subtilis.', 'When a person is sick and unable to eat, inject glucose and amino acids by dripping.', 'Alpaca digests food after rumination after eating.']