Although birds and mammals descended from differentancestors, they both have a four-chambered heart. Thisis the result of:
A) the necessity for rapid movement of blood.
B) convergent evolution.
C) genetic aberrations that resulted from mistakes insomatic cell division.
D) the simplification of the cardiovascular system

B) convergent evolution.

Explanation:

Convergent evolution in evolutionary biology is the process according to which, organisms that are not closely related, develop similar traits independently so that they will be able to  adapt to similar ecological niches or environments.  

Several examples of convergent evolution are shark and dolphin heads, bat and insect wings, and a four-chambered heart of birds and mammals. Analogous structures emerge from convergent evolution, but neither do homologous structures.

Hence, the correct option is B) convergent evolution.

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