How do you scroll down on a Mac without a mouse?

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Tags

1. #preferences
2. #under
3. #already
4. #system
5. #close
6. #fingers
7. #place
8. #current
9. #through
10. #heading
11. #checkbox
12. #scroll
13. #document
14. #trackpad
15. #selected
16. #macbook
17. #click