<span>If Billy believes evolution is slow and continuous, then he also believes in gradualism. Gradualism refers to the type of evolution that takes a long time to occur - as the name itself say, it all happens gradually, one segment at a time. This process is very slow, and cannot happen overnight, which is something Billy understands well.</span>
It shapes what kinds of words you use or how you approach the subject. if your writing to children you would write it differently then you would to adults, you would use smaller words, etc.
I believe the tone is somewhat dramatic based on the dialogue such as "shot his hand out in front of him", it makes the story seem a lot more interesting than what it really is; a normal encounter.
