1. Module 4 Intro

1.16. Lesson 3 Intro

Lesson 3

Module 4—Mechanisms of Population Change

Lesson 3—Evidence for Evolution

 

Get Focused

 

Helene Colbourne et al, Inquiry into Biology (Toronto: McGraw-Hill Ryerson, 2007), fig. 4.9A p. 127. Reproduced by permission. (left)

Courtesy of Todd Radenbaugh (right)

 


 

The images you have just looked at are of the Burgess Shale in Yoho National Park. The image on the left shows a creature from over 505 million years ago, during the Cambrian Period. The image on the right is from Yoho National Park today.

 

In Lesson 2 you learned about Darwin’s theory of natural selection, and you can use that theory to explain why some organisms survive and others do not. What proof do you have that natural selection is a usable theory? Fossils, like the ones in the Burgess Shale, can show that organisms have changed over time or have evolved. What other evidence is used by scientists to support and study evolution?

 

In this lesson you will explore the following essential question:

  • What proof is there that present-day species evolved from ancestral forms?
  Module 4: Lesson 3 Assignment

 

Your teacher-marked Module 4: Lesson 3 Assignment requires you to submit a response to the following:

  • Reflect and Connect

You can access your Module 4: Lesson 3 Assignment. You can print off the assignment or save the download to your computer. Your answers can be saved on this document to your course folder.