Welcome to the lesson "Prehistoric Earth". You need to click on the buttons and icons to move through the pages of the lesson. If at any time in this lesson you would like to return to this page just click on the "Beginning" icon. If at any time you would like to skip directly to the questions just click on the "Questions" icon. This will allow you to move the text at your own pace.
Click on the "Next" icon to begin your study of "Prehistoric Earth!!!