All animals feed heterotrophically, i.e. ready-made organic substances. Their methods of obtaining and absorbing food are varied, but the path of transformation of nutrients is similar and consists of the processes of mechanical, chemical processing of food, absorption of nutrients and their transport throughout the body. How is nutrition and digestion carried out in unicellular organisms?
1) unicellular animals (protozoa) feed on small food particles that capture or swallow whole – phagocytosis;
2) the digestion of food particles occurs in the digestive vacuoles, which contain digestive enzymes; such digestion is called intracellular.
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