Some auto parts you can exchange without much experience include drive belts, alternators and batteries. You can learn how to replace these parts yourself at the eHow website.
Well, only the green parts of a plant can.
no
Appendixes and foreskins
It is the shell
The Columbian Exchange refers to the exchange of plants, animals, people, cultures, ideas, and diseases between the New World (Americas) and the Old World (Europe, Asia, and Africa). You could also look at it as an exchange between the Western Hemisphere and the Eastern Hemisphere.
Parts could be replaced on a machine without replacing the entire machine.
I'm sure you could if you can find the parts you need and have the experience to do it.
You can go to exchange the wrong repair parts for new ones of your patio. For information view this site www.amazon.com, and www.ifixit.com/iPhone-Parts.
The following sites all provide parts: iapexperts, MG Cars and The MG Experience. Autotrader provides old MGB cars which could be used for spares and parts.
Without all four parts, its not a computer:Arithmetic Logic UnitControl UnitMemory UnitInput/Output UnitsAny of these could be arbitrary chosen as the firstpart.
Crossing over
It would be hard to find any part of significance, such as getting a speaking line. However, there are opportunities to be a part of the background.