Solution:

When a conducting wire of Copper and Germanium is cooled from room temperature to 80K:

• Copper (metal): Its resistance will decrease because metals have lower resistance at lower temperatures due to reduced electron scattering.
• Germanium (semiconductor): Its resistance will increase because the number of charge carriers (electrons and holes) decreases at lower temperatures, leading to higher resistance.

Thus, Copper's resistance decreases, while Germanium's resistance increases when cooled to 80K