Complete the following statement with the most appropriate answer from the options.

The resistivity of conductors ____ and that of semiconductors ____ with increase in temperature.

increases, decreases

1. For metals, with increase in temperature, the kernels start vibrating more rigorously, thereby, offering more resistance to the flow of electrons.
2. For semiconductors, with increase in temperature, the covalent bonds start breaking, thereby, releasing more carriers for conduction.