Spoken in 3 clips from 3 channels · B2–C1
01 / 3TED-Ed≈ approximate level C10:43–0:51 , .
02 / 3CrashCourse≈ approximate level B27:49–7:56
.
03 / 3TED≈ approximate level C16:10–6:18
, .
Keep “bacterial” until you know it
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3 clips · 3 channels Also heard in these clips