I am confused about macro lenses (or micro as Nikon calls them). Can we shoot normal (Nature) scenes using the macro lens?
Macro lenses can be used on subjects at more normal distances. They are not just for close up objects. You can shoot portraits with the 60mm or 105mm Micro for example, as those are good focal lengths for portraits.
Macro lenses are generally very sharp, but bokeh may not be as nice as a standard lens.
Macro lenses are optimized for close-up photography and small f-stops (because depth of field is reduced the closer you get to a subject, so small f-stops (larger numbers) are usually required). They will focus closer than non-macro lenses. They work quite well for everyday photography, too. However, they are usually not "fast" lenses, quite often around f4. So, you won't be able to get the "subject-in-focus-and-background-totally-blurred" image as easily than if you had a fast f1.7 or f1.4 lens. But if you move close to an object, because your depth of field is reduced, you can still get this effect, even at f4.