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Phagocytosis is a process in which a living cell engulf (eat up) foreign particles or other unwanted cells.
Example of a phagocyte is:
White Blood Cell (WBC) which is present in our body and carries out phagocytosis.

The image will help you know the exact working of this process.

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Phagocytosis is the indigestion of bacteria or other material by phagocytes and amoeboid protozoans.