What is the fundamental characteristic of animals belonging to the phylum Chordata?

Step-by-step solution

Animals belonging to the phylum Chordata are bilaterally symmetrical, triploblastic, coelomate with organ-system level of organisation. Animals belonging to phylum Chordata are fundamentally characterised by the presence of a notochord. They (Members of Phylum Chordata)possess a post anal tail and a closed circulatory system.The members of subphylum Vertebrata possess notochord during the embryonic period. The notochord is replaced by a cartilaginous or bony vertebral column in the adultVertebrates have a ventral m