THEORIES FOR LAND TRAVEL

  • there are two types: lungfish and crossoptergians
  • when more tetrapods started to appear at 340 Ma
  • There was a branching of two groups
    • Amphibians - Laid unshelled eggs
    • mammals, dinosaurs, and reptiles laid amniotic eggs.
  • This is an evolutionary tree for the earliest tetrapods.
  • It starts out with the lobe-finned fish and then branches into two with amphibians branching off by itself to the left.