question: Forefathers of what kind of fish are thought to be the earliest vertebrates?
choices.text: hagfish Pelycosaur fish angiosperm adult Therapsids marine aquatic
choices.label: A B C D E F G H
fact2: Property of ancestors and forefathers can only be legally inherited by sons.
combinedfact: The forefathers of hagfish are thought to have been the earliest vertebrates.
formatted_question: Forefathers of what kind of fish are thought to be the earliest vertebrates? (A) hagfish (B) Pelycosaur (C) fish (D) angiosperm (E) adult (F) Therapsids (G) marine (H) aquatic