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The active form of Entamoeba histolytica feeds upon:

1. mucosa and submucosa of colon only
2. food in intestine
3. blood only
4. erythrocytes; mucosa and submucosa of colon

Correct answer: erythrocytes; mucosa and submucosa of colon

Solution

The active trophozoite of Entamoeba histolytica is invasive: it destroys and feeds on the mucosa and submucosa of the colon. It can also phagocytose erythrocytes, which is a classic sign of pathogenic infection.

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