EVOLUTION 101

You are about to play NOVA’s Evolution Lab—a game that will help you to understand the ways scientists piece together the tree of life. But before you begin, watch the "Evolution 101" video and answer questions 1–5 below.

Keyboard Shortcut	Action
Space	Pause/Play video playback
Enter	Pause/Play video playback
m	Mute/Unmute video volume
Up and Down arrows	Increase and decrease volume by 10%
Right and Left arrows	Seek forward or backward by 5 seconds
0-9	Fast seek to x% of the video.
f	Enter or exit fullscreen. (Note: To exit fullscreen in flash press the Esc key.
c	Press c to toggle captions on or off

1-4. Click the button below to answer questions 1-4. Remember to refer to the video if you are not sure of your answers.

5. What is happening in this image? How does it help to illustrate the concept of natural selection?

Now you can start playing the Evolution Lab Build A Tree game! Click on "Play Game" and sign in with either a Facebook, Google, or PBS account so that you can save your progress through the game. Each page of this interactive lesson contains questions for each video and level from each mission of the game. Make sure to read the instructions on every page and answer the questions after watching the video or completing that specific level of the game.

Remember to refer to your completed tree and the species comparison tab when answering all of the questions, so keep the level open while you're answering the questions in this interactive lesson.