Question

According to scientists, the organisms in the picture all evolved from a common ancestor. What evidence backs up this theory?
Responses
A These organisms are all of the same species.These organisms are all of the same species.
B These organisms contain very similar bone anatomy.These organisms contain very similar bone anatomy.
C The appendages of these organisms share similar function.The appendages of these organisms share similar function.
D These organisms all lived in similar habitats and were therefore under similar environmental pressures.

Answer 1

B

The organisms show homologous structures — very similar bone anatomy (same bones arranged similarly) modified for different uses. That pattern indicates descent from a common ancestor. (Similar function or similar habitats can result from convergent evolution and do not by themselves show common ancestry.)