All deuterostomes have a coelom.
All deuterostomes are triploblastic and have three tissue layers.
All deuterostomes exhibit radial symmetry in their bodies.
All deuterostomes have a similar pattern of early embryonic development.
All vertebrates have jaws with which to catch their prey.
The development of an amniotic egg and internal fertilization allowed vertebrates to reproduce away from water.
The development of more efficient surfaces for gas exchange in reptiles stimulated expansion into terrestrial habitats.
Birds are more related to mammals than to dinosaurs.
They are Eukaryotes
They are in the Metazoans
They are in the Bilateria
They have a vertebral column
They all have a notochord
A convergent trait that evolved in the Chordata
The primitive umbilical chord
A homologous characteristic that arose in the chordates
A flexible rodlike structure that is present at least in the embryotic stage of chordates
Both C and D
It prolongs embryonic development
It allows deposition of eggs in a terrestrial environment
It provides insulation to conserve body heat
It permits internal fertilization to be replaced by external fertilization
It has a shell that increases gas exchange