Put the following sequence of events in the correct order by placing a “1” indicating the first event, and a “4” indicating the last event:

How did wolves, whales, and the Mystery Fossil become so different from their common ancestor population?

Launch Evolutionary History Modeling Tool activity: Population Changes.

In the Modeling Tool, a population is divided into two populations in different environments. In each environment, different structures are useful for survival.

Goal: Show how the body structures of the populations in each environment might change over time.

Do:

• Read the information at the top of the screen.

• Move organisms from the toolbar to the open locations in both branches of the tree.

• Press INDICATE ORGANISM TYPE and select an option for each organism.

Tip:

• You do not have to use all the organisms in the toolbar.

How does this model show how species that share a common ancestor can become very different from one another?

CFS:

• student describes the relationship between anatomical similarities and differences in animal species

• student describes the chronological difference between animal species with a common ancestor based on body structures

What remains stable over time in your model? What changes?

CFS:

• student describes the relationship between anatomical similarities and differences in animal species

• student describes the chronological difference between animal species with a common ancestor based on body structures

Why do you think the body structures of each population at time 2 are different?

CFS:

• student describes the relationship between anatomical similarities and differences in animal species

• student describes the environmental difference between animal species with a common ancestor based on body structures

Why do you think the body structures of each population at time 2 are different?

CFS:

• student describes the relationship between anatomical similarities and differences in animal species

• student describes the environmental difference between animal species with a common ancestor based on body structures