Answer:
The correct answer is: common ancestor
Explanation:
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According to the evolution of living beings, we all have an ancestor.
Depending on the branch in which the living being is, it unites with the ancestor of another.
Two different branches that never join, do not have a common ancestor. In this case, they have a characteristic that unites them, so whales and pythons have a common ancestor.
The correct answer is: common ancestor
