question: Ancestors of hagfish are thought to have been the earliest
choices.text: filter feeders unicellular organisms carrying offspring to birth animals with backbone last stage before adulthood prokaryotic cells To survive in their environment inherited antigens + antibody
choices.label: A B C D E F G H
fact2: Vertebrates are animals with backbones.
combinedfact: Ancestors of hagfish are thought to have been the earliest animals with backbones.
formatted_question: Ancestors of hagfish are thought to have been the earliest (A) filter feeders (B) unicellular organisms (C) carrying offspring to birth (D) animals with backbone (E) last stage before adulthood (F) prokaryotic cells (G) To survive in their environment (H) inherited antigens + antibody