Potential answers for "Key constituent"

⭐⭐⭐⭐ BUILDINGBLOCK
⭐⭐ URACIL
⭐⭐ RNA
⭐⭐ ADENINE
⭐⭐ URANIUM
⭐⭐ UAW
⭐⭐ TALC
⭐⭐ METHANE
⭐⭐ NITRO
⭐⭐ ALGA

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