What are the characteristics of protozoans that make them resemble animals?

What are the characteristics of protozoans that make them resemble animals?
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Protozoans are unicellular beings with some similar characteristics to animal cells. In comparison to pluricellular organisms protozoans are more proximal to the animal kingdom than to plants: they are heterotrophs, they have a rudimentary locomotion system (amoeboid movements, cilia, flagella), they do not have cell wall, some species present structures that resemble structures of a primitive digestive system, with cytostome (mouth) and cytopyge (anus), specialized in digestion and excretion. The evolutionary hypothesis that animal cells have come from differentiation of protozoans is strong.
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Protozoans ingest food through?

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Are protozoans presenting contractile, or pulsatile, vacuoles easily found in fresh or in salt water?

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How is digestion performed in protozoans?

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What do protozoans “eat”? Do they move in search for food?

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