Question

what is a common ancestor? the oldest living member of a family or population of organisms the organism that was the beginning of multiple new species as a result of evolution

Explanation:

A common ancestor is an organism from which multiple species have evolved. It is not just the oldest living member of a family or population. Evolutionary processes lead to the divergence of species from a common ancestor.

Answer:

the organism that was the beginning of multiple new species as a result of evolution