Which evolutionary process would best account for the observation that there is a striking similarity in both form and function of the enlarged horns observed in males of some insects and some mammals?

Which evolutionary process would best account for the observation that

1.	Which evolutionary process would best account for the observation that there is a striking similarity in both form and function of the enlarged horns observed in males of some insects and some mammals?
Answer» Which evolutionary process would best account for the observation that there is a striking similarity in both form and function of the enlarged horns observed in males of some insects and some mammals?