Answer:
Mercury, rontgen rays, etc.
Explanation:
There are lots of answers to this question, hope these two help.
Answer:
upload; download
Explanation:
FTP (File Transfer Protocol) is an internet protocol used to upload and download a file to a server, there are some programs help us to transfer this data to a server, in some cases, we're going to need these programs to upload website files to the server like images or videos, or some websites where do you need a user and passwords to upload file by FTP
