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Diamond, ruby, emerald, sapphire — which precious gem is the most magnificent?

Body fossils, trace fossils, mold fossils, amber preservation — which fossil type tells the best story?

Spiral, elliptical, irregular, barred spiral — which galaxy type is the most spectacular?

Sunlight, twilight, midnight, abyssal, hadal — which ocean zone hides the most secrets?

Noble gases, halogens, alkali metals, transition metals — which element group rules chemistry?

Tundra, rainforest, desert, savanna — which biome is the most critical for Earth?