A group of single-celled organisms found in freshwater that have a spherical shape with ray-like projections radiating outward.
From Greek 'helios' (sun) + 'zoon' (animal), literally meaning 'sun animals' because their radiating spines resemble the Sun's rays.
These microscopic creatures look exactly like tiny suns under a microscope, which is why scientists named them after our star—and despite being nearly invisible, they're fierce predators in pond water.
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