While studying evolution a student comes across a cladogram that includes clades like amphibia, reptilia, aves, and mammalia. What must be the basal clade?

A. plantae

B. chordata

C. nonchordata

Amphibia, reptilia, aves, and mammalia belong to the Kingdom Animalia or animals as they are called. These clasifications of animals mentioned above has cord on their bodies unlike animals with no vertebrae like sponges and other aquatic organisms, the basal clade of these animals is B. chordata