These single cells constantly change their shape. They appear to surround and engulf organic matter into food vacuole.

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Protists, which are a diverse group of eukaryotic microorganisms, often exhibit the behavior described. They can change their shape and engulf organic matter into food vacuoles through a process known as phagocytosis. This characteristic is particularly seen in amoeboid protists.

These Single Cells Constantly Change Their Shape