Yes. It fits, no problems.
18" standard, but 15" suggested if installing garbage disposal.
plumbing diagram of double bowl sink with disposal
Yes, you can.
The in-sink garbage disposal is certainly not the greenest way to deal with your kitchen waste.
Undermount is actually a style of sink. This style of sink is mounted below the edge of the counter so there is no lip around the sink. It is important that stainless steel undermount sinks be properly installed using a two-part epoxy adhesive and silicone caulking as a sealant.
use slicone glue
I would. I use to install granite but now I remodel custom kitchens. Almost every sink in a granite top is a undermount sink. Unless you had a decent undermount sink to begin with that could be reused, I would get a new one.
Using a sharp wood chisel and a craft knife, it's possible to cut it off. -I've done that on 2 occasions. Needless to say, be very careful you don't scratch the sink.
The appliance under the kitchen sink that grinds food waste and puts it down the drain.
If the sink/sink drain fitting connection, sink drain fitting/disposal connection, dishwasher/disposal connection, disposal/drain elbow connection are what are leaking they can either be tightened or have gaskets replaced or other sealing methods used. If the disposal is leaking elsewhere the disposal needs replacement.
Waste disposals or garbage disposals are unit used in the kitchen, and mounted under the sink between the drain and the trap. They grind or shred food particles and waste into very small pieces so it will go through the plumbing with out clogging the drain.
Undermount stainless...classic good looks and easy to maintain.