 
<translate> Ndị na-agba okirikiri nwere ọkpụkpụ azụ. Anụ ndị na-enweghị azụ̀ bụ anụmanụ ndị na-enweghị ọkpụkpụ azụ ma ọ bụ ọkpụkpụ azụ. Ndị nwere akwara n'azụ nwere akwara azụ. N'ihi ya, azịza ya bụ (A). <eng> Vertebrate chordates have a backbone. Invertebrates are animals who lack a backbone or spinal column. Vertebrate chordates have a spinal column.
Thus, the answer is (A). 