Plural of alga; microscopic or macroscopic plants living in water that are simple and lack true roots, stems, or leaves.
From Latin alga (seaweed), possibly related to an Indo-European root meaning 'to grow' or 'plant.' The term became standardized in scientific classification.
Algae produce over half of Earth's oxygen while being invisible to most people—they're literally keeping us alive from inside water droplets and oceans!
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