Natural Selection is the process by which one type of ____ within a species thrives because of certain characteristics that make it more ____ to live than others in its ____. The history of the peppered moth is an example of the natural ____ process. In nineteenth-century England, ____ types of peppered moths were able to better ____ into their surroundings. During that time period, great ____ were happening in Great Britain. The Industrial Revolution was part of this change, and with it came air ____. Natural selection often takes ____ or even thousands of years to occur. For the peppered moth, this process occurred ____ quickly. At the ____ of the Industrial Age, most peppered moths in England were light-colored moths blended into the light-colored bark on the ____, they could not be easily seen by birds that would eat ____. As the air grew more ____, however, tree trunks became covered with ____ and became darker. The light-colored moths became ____ for birds to see against the dark tree trunks. Since the dark-colored moths now had the advantage, their numbers ____. Within 50 years, the peppered moth went from being mostly light-colored to being mostly dark-____. In the twentieth century, the air significantly ____ up, and the peppered moth population changed ____. As tree trunks ____ due to less soot in the air, light-colored moths once again had an ____. Their numbers increased as soot levels ____. Depending on their environment, the coloration of the moths helped them to be "naturally selected" to ____.

The Peppered Moth

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