Respuesta :
Answer:
Invertebrates
Explanation:
Invertebrates have existed since the late Precambrian Era about 3.5-3.7 billion years ago. Vertebrates didn't start existing until the late Ordovician Era when jawless fish evolved.
Answer:
Invertebrates
Explanation:
Invertebrates have existed since the late Precambrian Era about 3.5-3.7 billion years ago. Vertebrates didn't start existing until the late Ordovician Era when jawless fish evolved.