The majority (~97%) of animal species are invertebrates, which are animals that neither possess nor develop a vertebral column (commonly known as a backbone or spine), derived from the notochord.
Tăššăma n 97 daɣ temede n tăqqǝmen n ǝmudărăn war ǝlen , amosăn arǝzzej war n ǝla meɣ wăr n asǝdwǝl ǝɣăsăn w-ǝn arori (s ǝsmăwăn năsăn arori ǝd ǝzjărăn notochord