We know that tiktaalik is more closely is more related to acanthostega than it iscanyhostega eusthenopteron because tiktaalik and A

The answer is : Both have true necks, while eusthenopteron has no neck. We know that tiktaalik is more closely related to acanthostega than it is Ichthyostega eusthenopteron because Tiktaalik and Acanthostega both have true necks while eusthenopteron has none.