contestada

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

Respuesta :

The correct answer would be that; The limbs of species A perform a function that is similar to the limbs of species B, but they have a different structures. 
All species share a common descent. In evolutionary biology, a group of organisms share common descent if they have a common ancestor. There is strong quantitative support for the theory that all living organisms descended from a common ancestor. 
Mammoet

Expiation:

Scientists often find cases in which a feature of an organism from one species is structurally similar to a feature of an organism from a different species. The features may perform very different functions in each species. This may indicate that the two species have a common ancestor.

If one community of a species experiences a long-term change in its environment, this community may undergo adaptation to survive in the new environment. Eventually, this community may even develop into a new species. The structures of the organisms in the new species may have new functions, while still resembling the structures of their ancestors. This would explain how similar structures can have very different functions in two or more species.