Identify a system and describe it in terms of
•its function and its aim•what is part of the system and what is part of the environment
•input, output
•components, their attributes and relationship between components and attributes
•the relationship between components (components are interrelated )
•multi-level hierarchy (systems and subsystems)

Explain briefly why you cannot expect to find a previous version of every file with which you work.

What is the primary difference between the header section of a document and the body? a. the body is displayed on the webpage and the header is not. b. the header is displayed on the webpage and the body is not. c. the tag for the body is self-closing, but the tags for the headers must be closed. d. the tag for the header is self closing, but the tag for the body must be closed.

Ideally, the backrest is tilted back slightly, so when you turn the wheel your shoulders are the seat.