Biology / Unit 8 Bio 1669 short lesson, about 20 seconds
Biogeography as Evidence
Captions available
The idea
Biogeography traces species' geographic distribution to tectonic history, since lineages that diverged before a supercontinent's breakup spread differently than lineages that diverged after.
In practice
A plant family found across Australia, southern Africa, and South America traces to ancestors present on the once-joined southern supercontinent Gondwana.
Where people slip
Similar species distributed across isolated regions reflect shared ancestry and tectonic history, not independent origin in each location.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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