Oh okay, they should both be decreasing.

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1. The drift velocity increases and resistance decreases.

2. valence electrons are free to roam, but have a probability of collision per unit time that is 1/t.

3. This question may not have a unique answer because The origin of the magnetic moments responsible for magnetization can be either microscopic electric current resulting from the motion of electrons in atoms, or the spin of the electrons or the nuclei. It really depends on the particular type of material.

If we are forced to choose one answer. I will say the final one: the spin of electrons, the orbital angular momentum and (to a much less degree) the nuclei spin.

4. They attract each other.