Answer:
Euglena are characterized by an elongated cell (15–500 micrometres or 0.0006–0.02 inch) with one nucleus, numerous chlorophyll-containing chloroplasts a contractile vacuole (organelle that regulates the cytoplasm), an eyespot.
Euglena is a photosynthetic euglenoid with at least 150 described species. The cells are cylindrical with a rounded anterior and tapered posterior.
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