Final answer:
Cephalochordates belong to the phylum Chordata in the animal kingdom and possess specific characteristics at different stages of their development. The correct option is D A, B and C
Step-by-step explanation:
Members of Cephalochordata possess a notochord, dorsal hollow tubular nerve cord, pharyngeal slits, endostyle/thyroid gland, and a post tail in the adult stage.
The notochord extends into the head region. In addition to Cephalochordata, animals in the phylum Chordata share the same four key features at some stage of their development: a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post tail.
These traits may be present only during embryonic development in certain groups. The correct option is D A, B and C
The question is incomplete, The complete question is below.
Phylum Chordata is characterised by the presence of
A. notochord
B. dorsal hollow nerve cord
C. paired pharyngeal gill slits