What are the differences between an intrinsic and extrinsic semiconductor ?

Name the charge carriers in the following at room temperature.

$\left(\mathrm{i}\right)$ conductors

Name the charge carriers in the following at room temperature.

$\left(\mathrm{ii}\right)$ intrinsic semiconductors

Name the charge carriers in the following at room temperature.

$\left(\mathrm{iii}\right)$ insulators. 

How does the resistance of a semiconductor change with rise of temperature ?