Friar Laurence advises Romeo to take things slowly so that failure can be avoided. He tells him to calm down and "love moderately", meaning to take it easy.
Diversification plays a big role in evolution. There are several
differen't diversification: behavorial, temporal, habit, gametic, and
mechanical isolations. Based on these diversifications, animals breed
and evolute. Each animal has their own mechignisms it follows. I agree
with Darwin that Diversification plays a huge role in evolution.