And notably, there's some dissent there that the modern Disney/Pixar versions are wrong (there's an arbitrariness to scanners, plus no particularly objective recordings of what you'd actually see at theaters back then) IIUC.
They aren’t. Apart from DNA replication, transcription, and translation, their genome lacks elements encoding for even the most simple metabolic pathways.
Then where are they getting the materials to replicate? Where are they getting the energy? Magic? No, they're pulling pre-metabolized materials and energy from the host.
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