JAMB - Biology (2009 - No. 5)
The first terrestrial vertebrates evolved from
pisces
reptilia
amphibia
mammalian
Forklaring
- The earliest vertebrates resembled hagfish and lived more than 500 million years ago. As other classes of fish appeared, they evolved traits such as a complete vertebral column, jaws, and a bony endoskeleton. Amphibians were the first tetrapod vertebrates as well as the first vertebrates to live on land.