Differences between input device and storage device

Ineed on my history if anyone can check out the last few questions i posted and i will be posting !

What are the three uses of a screw?

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.