The organism you choose should be a real one but the evolutionary change you des

The organism you choose should be a real one but the evolutionary change you describe can be real or theoretical. In your own words Explain how the change in this trait occurs in terms of the four postulates listed above and in the book. You will describe what the population starts out like at time zero and then what it will look like at a later time as a result of natural selection. Make sure to explain the process by which the changes occurred. What is the selective pressure? Explain why the change might confer more fitness to a particular environment?