Describe the group of the phylum Chordata

Question

Describe the group of the phylum Chordata which first colonized the terrestrial atmosphere? From which habitat did phylum Chordata come?

Answer 1

Amphibians, partly aquatic partially terrestrial animals, were the primary chordates which colonized the dry land. They came from aquatic habitat and were created from fishes. (Nonetheless the first totally terrestrial chordates were reptiles).