A single-celled organism that can be both plant-like and animal-like, living in fresh water and containing a green pigment for photosynthesis.
From Greek 'eu-' (well, true) + 'glene' (pupil of the eye), referring to the organism's eye-like stigma (light-detecting spot). Named in the 1830s because of this distinctive feature.
Euglenas are nature's shape-shifters—they can photosynthesize like plants during the day but also eat other organisms like animals at night, making them a perfect example of how life doesn't always fit into neat categories. Biology textbooks love them because they blur the line between plant and animal!
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