[Campbell Biology P.585] Based on Figure 25.12, what is the minimum estimated age of the mos... | Practice Question

Based on Figure 25.12, what is the minimum estimated age of the most recent common ancestor of chordates and annelids?

  • A: Approximately 635 million years ago.
  • B: Approximately 605 million years ago.
  • C: Approximately 585 million years ago.
  • D: Approximately 545 million years ago.

Explanation

Locating the branch point on Figure 25.12 that represents the most recent common ancestor of chordates and annelids, it falls between 605 million years ago and 575 million years ago, closer to the latter. A minimum estimate around 585 million years ago is consistent with the visual representation.