[Campbell Biology P.767] Based on the provided diagram "What are some key characteristics th... | Practice Question

Based on the provided diagram "What are some key characteristics that have appeared during vertebrate evolution?", which of the following characteristics appeared earliest in vertebrate evolution?

  • A: Limbs with digits
  • B: Amniotic egg
  • C: Jaws and a mineralized skeleton
  • D: Lobed fins

Explanation

The diagram shows that 'Skull and backbone' is the earliest derived characteristic for vertebrates, followed by 'Jaws and a mineralized skeleton'. 'Lobed fins', 'Limbs with digits', and 'Amniotic egg' appear subsequently in the evolutionary tree.