Yes you can but it will be like taking a rock crawler Jeep to a racetrack. The DH bike will be pointlessly heavy, the suspension will sap a lot of pedalling energy and the shallow head tube angle will make steering sluggish. And unless you have the mother of all seat posts you're unlikely to be able to set up an efficient pedalling position.
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Yes, but you do not have the same kind of control that you do with downhill skis partly due to the bindings only holding the toe of the cross country boots. The "Telemark" binding gives some better control.
The difference is that a downhill ski is much wider along with the binding, a cross country binding is only connected at the toe of a boot. when a downhill binding is connected at both the heel and the toe.
hope this helped
You can.
But they are not built and designed for the same thing, such as the speed downhill skiers achieve.
Cross country skis are are much wider, intended to reduce ground pressure. Downhill skis are narrower, to reduced resistance, and intended more for packed snow.