i) Among chordates vertebrates is the largest group.
ii) There are more than 47000 of vertebrates are present on land.
iii) Vertebrates are divided into 5 different classes.
iv) These classes are Pisces, Amphibia, Reptilia, Aves, mammalia.
v) A common characteristic of vertebrates is presence of vertebral column.
vi) The anterior end of vertebral column is box like called cranium which
protects the brain.