No.
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The Nintendo 3DS will be able to play Nintendo DS and DSi games but games published for the Nintendo 3DS will not be compatible with those systems.
No, because Nintendo put a little stub on the 3DS cartridges, so when you put in the DS slot it doesn't fit. Also, if the stub wasn't there, the DS wouldn't be able to handle the 3DS' graphics and wont load the 3D effect of 3DS games on a standard DS or even DSi.
No, there is no way to do so. The 3DS will support Miis, though.
You don't. The DS Lite doesn't have an SD slot; only the DSi does (including DSi XL.)
yes you can download ar and put it on a ds or 3ds any one works I tryied to too