An ameba is a single-celled organism. it uses its cell membrane to obtain food from its environment, digests the food with the of organelles called lysosomes, and uses other organelles to process the digested food. from this, we can best infer that

(1) all single-celled organisms have lysosomes to digest food
(2) amebas are capable of digesting any type of food molecule
(3) single-celled organisms are as complex as multicellular organisms
(4) structures in amebas have functions similar to organs in multicellular organisms

According to me answer no 4  is correct.

Explanation:

single cell amoebas can perform all life functions capture the food, digestion, respiration, excretion, and reproduction also. These all are similar to multicellular animals.

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answer: the correct option is d. enzyme

lactase and carbonic anhydrase are the examples of enzymes.

lactase is an enzyme, which is present in the small intestine of mammals. it in the digestion of the disaccharide, lactose ( milk sugar) by converting it into two monosachharide, which are glucose and galactose.

carbonic anhydrase is present in the red blood cells. this enzyme plays significant role in the transport of co₂. it in the conversion of co₂ and h₂o into carbonic acid, which is then dissociated into bicarbonate ions and hydrogen ions.