Pre-lab: Simulating Natural Selection

Course manual: Simulating Natural Selection lab; The Chi-Square Test (for review)

Activity and questions:

Go to the PBS Evolution Project website:

Watch the short (6.5 min) video titled: How does evolution really work?

Answer the following questions on the video.

1. Which four processes of natural selection were discussed in the video?
2. How do hummingbirds experience the "struggle for existence"?
3. Describe a change in the hummingbird's environment that would affect bill length and how such a change in bill length would occur through natural selection.