Biology / Unit 10 Bio 2315 review, 2 to 3 minutes
Tracing Tetrapod Evolution from Lobe-Finned Fish to Amniotes
Captions available
The idea
This capstone traces the vertebrate lineage from an ancestral lobe-finned bony fish through early tetrapods and amphibians to the amniote radiation producing reptiles, birds, and mammals.
Where people slip
This trace runs through several branch points, not one straight line — bird ancestry runs through the reptile branch specifically, not through mammals, despite birds and mammals sharing warm-bodied traits that evolved independently along separate amniote lineages.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Something wrong in this lesson? Flag it · Sources for Biology