No, you'll have to purchase a USB microphone.
The Mac mini does not have a built-in microphone. External microphones must be pre-amplified (line level), so many off-the-shelf computer microphones may not work.
Yes it does.
To attach a microphone to a Mac Mini requires a connector such as the iMic (See links below) or a USB mic that will plug in directly.
Apple makes a range of Mac computers. Most of them include a built-in microphone.
Most desktops come with a built in screen (all in one piece) but if you get a Mac Mini, which doesn't have a built in screen, you can use any monitor, it doesn't have to be Apple.
http://www.apple.com/mac-mini/
Yes, it does have a microphone, as well as a built in webcam.
Mac Mini was created on 2011-07-20.
Yes, mac computers that come with a built in web-cam also come with a microphone and audio recording system. If that doesn't work, it is possible to attach an auxiliary microphone to a mac computer.
You cannot put a Mini Disc physically into a Mac. You can connect a Mini Disc player to the Mac and listen to it through some audio software.
No. The graphics "card" in a Mac mini is integrated into the motherboard. There are also no available expansion slots in a Mac mini. You can see some photos of the inside of a Mac mini in the "Related Links" link below.
You can walk into a store and buy any kind of headphones or earbuds that will work with with CD players, Computers, any MP3 players, Mac, PlayStation Portable, Nintendo DS. for microphone capabilities, you will need to buy a headphone with a built-in microphone, this will only work with a PC. Special headphones are required for the PlayStation 3 and XBOX 360 that have a built in microphone. There are several different companies that make different styles of headphones with built in microphones.