The features do the best elliptical machines have adjustable resistance and movable handles. The things they have vary from brand and model.
Cardio and aerobic exercise is essentially the same thing. Elliptical machines provide this sort of exercise.
You may want to try an elliptical trainer. These machines put less strain on your joints than conventional treadmills. Other options, that do not require expensive exercise equipment, include swimming or simply doing pushups.
Fax machines do come in multiple-tray configurations. The trays may serve to sort incoming faxes by the phone number they are coming from. Such features require Caller ID be enabled on the fax machine's line.
Any kind you want.
You need to know what sort of degrees they offer and exactly what sort of equipment they will train you to operate. You want to learn how to use those machines which offer you the best jobs once you have a degree.
There are many great fitness machines for working out the abs. Any sort of ab crunch machine is great for abs.
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Depending on what brand you bought, you may be able to go to their main site and download instructions there. They may also have a tutorial, or some type of fitness guide that would help you learn how to use your new machine. If they don't have any sort of support for their device, I suggest using YouTube to find a fitness video that revolves around using elliptical machines.
It is sort of like science, only it's science fiction.
For us to answer this question you need to be more precise and tell us what sort of features you are asking about, geographical features, feature films, biological features, human features etc.
quick sort
selection sort