Extended Response:
The structures organisms have develop over time in response to stresses in the environment. This process is called Natural Selection. Use at least 2 examples to describe how natural selection works. Describe the stresses that an organism must adapt to and the role of mutations in adaptation.

OR

The peppered moth lives in Europe. In England they have been monitoring its population since the 1700’s. There are two varieties, light colored and dark colored. The moths live on pollen from trees, they particularly feed on birch pollen. Birch trees have light colored bark. In the mid 1800’s England underwent the industrial revolution during which a tremendous amount of coal was burned, and therefore tons of dark coal soot covered everything, including the trees. Below is a graph of the number of dark colored individuals in the population over time. At the time of the industrial revolution you can see a dramatic increase in the number of dark colored individuals in the population.

ON THE GRAPH draw a graph of what the light colored population most likely underwent during the same time period. Describe how the Peppered Moth is an example of the process of Natural Selection. Be sure to describe what natural selection is and what it is in response to.

Possible “Short Answer”

• Define the term “Natural Selection” Using information from the video “Voyage to the Galapagos” and/or the presentation from class explain how it works.

• List the three types of symbiotic relationships covered in class. Choose one give an example of one and describe the benefits/harm to organisms in the relationship.

• Choose one of the methods of determining population size discussed in class. Explain when you would use it and how it works.

• List four types of “Environmental Stress” that may lead populations to change. Choose one and clearly describe how it may influence a population of organisms.

• List three limiting factors for a population of organisms. Choose one and describe how this factor can limit population growth.

• List three biotic factors and three abiotic factors that may be found in an ecosystem in Delaware. Describe the difference between biotic and abiotic factors