Biology / Bio 1677 · Atom · ~20 seconds
"Organisms Evolve Because They Need To"
Video not yet published
to the StudyWalks catalog
to the StudyWalks catalog
State
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.
Show
Antibiotic-resistance genes already existed at low frequency before antibiotic exposure, which then selected for their carriers.
Watch for
An environmental change does not summon a new adaptation on demand — it only selects among variation already present.