The phylum Chordata contains the most highly developed marine lifeforms – we are chordates too (although rather more advanced than a sea squirt!). Simply put, chordates all possess some kind of backbone at some point in their development.
The phylum Chordata contains the most highly developed marine lifeforms – we are chordates too (although rather more advanced than a sea squirt!). Simply put, chordates all possess some kind of backbone at some point in their development.