The entire course of cosmic history has been leading up to the creation and expansion of Bradford Pear Trees.  As you can see from the plot below, all salient events in Bradford Pear Tree history line up in a smooth exponential line.  This proves that Evolution favors the creation of Bradford Pear Trees since there is no other explanation as to why this plot would be exponential.  Right?

Furthermore, since this trend has continued for 14.7 billion years, we can safely assume that Bradford Pear Trees will continue to expand eventually consuming the entire Universe.  

This is all quite inevitable.