Week 6 Introduction

When asked what evolution is, we may imagine primitive man like Australopithecus evolving into humans or dinosaurs which are believed to be ancestors of lizards or crocodiles. Most of us think of the evolution as a process that happened millions years ago. But this is a misconception we often make. In fact, evolution is still working today although the changes don’t appear significantly. Since nylon was invented in 1940s, nylon eating bacteria are nothing but new. The bacterium Pseudomonas can metabolize nylon due to certain enzymes it has. Surprisingly, however, same thing happens when you place non-nylon eating bacteria in an environment where the only type of food available is nylon. Whenever the experiment was tried, the bacteria would evolve until it was able to consume nylon. This example shows that most forms of life can adapt to their environment by evolving.
Then what about us; is human still evolving these days? My answer is yes: human being is also evolving and there are several evidences that support this

1. Attention grabber -
I attracted the audience by saying that primitive men or dinosaurs comes to our mind first when we think of evolution. Then I pointed out something what most of people ignore – that evolution is ongoing process.

2. Explains the topic -
In the attention grabber I introduce all the elements of my topic: evolution is ongoing process not only to bacteria and other wild species but also to human being

3. My thesis -
It is clear, direct and an argument. I thought the argument "Human being is still evolving" was too simple. So I used rhetorical question so that it can attract readers more.