question: Ancestors of hagfish are thought to have been the earliest animals with?
choices.text: sunlight cells several genes fossil record ice backbones pigmentation antibodies
choices.label: A B C D E F G H
fact2: Animals with backbones are called vertebrates.
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 animals with? (A) sunlight (B) cells (C) several genes (D) fossil record (E) ice (F) backbones (G) pigmentation (H) antibodies