Question

Which of the following would provide the best evidence that species A and species B have a common ancestor? A. The limbs of species A have a similar structure to the limbs of species B, but they perform a different function. B. Species A has limbs, and species B does not have limbs. C. The limbs of species A perform a function that is similar to the limbs of species B, but they have a different structure. D. The limbs of species A and species B have a different structure and function.

Answer 1

Answer should be A) the limbs of species A have a similar structure to the limbs of species B but perform different functions that is homologous to each other
Hope it will help u

Answer 2

Answer:

The best evidence that species A and species B have a common ancestor would be option A: the limbs of species A have a similar structure to the limbs of species B, but they perform a different function.

Explanation:

This is because:

• Similarities in structure suggest that the limbs of both species evolved from a common ancestor, and have been modified over time to perform different functions in each species.
• Differences in function suggest that the limbs have undergone adaptive changes in each species to suit different ecological niches, while retaining some ancestral features.
• This pattern of evolution is consistent with the theory of common descent, which posits that all living organisms are related through a shared ancestry, and have evolved through a process of descent with modification.
• Option B is not a good indicator of common ancestry, because the absence of limbs in species B could be due to evolutionary loss or adaptation to a limbless lifestyle, rather than a lack of ancestry with species A.
• Option C is also not a good indicator of common ancestry, because similarities in function could be due to convergent evolution, where two unrelated lineages evolve similar adaptations to similar environments, rather than a shared ancestry.
• Option D is inconsistent with the theory of common descent, which predicts that related organisms will share some similarities in structure and function, even if these are modified over time.

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