"Organisms Evolve Because They Need To"
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Organisms do not evolve a trait because they need it, the mechanism-level expansion of Unit 1's Bio 0057 — variation must already exist before any pressure appears.
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Antibiotic-resistance genes already existed at low frequency before antibiotic exposure, which then selected for their carriers.
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An environmental change does not summon a new adaptation on demand — it only selects among variation already present.