Two groups of organisms with similar characteristics may share O A a common ancestor.
B. an evolutionary history.
O C. both A and B.
O D. neither A nor B.

What are the activitys?   sorry if this took your points : (

Firstly, the planetary model of the atom  failed  to explain why individual atoms produce discrete  line spectra. in fact, according to rutherford's model, each individual atom should produce a  continuous  line spectrum. the second flaw to his model was the fact that electrons orbit the nucleus in a circular fashion.