Help pls. Are they a pure substance or mixture?

Ionly need 1 example for each one plz me i will make brainlist me fast using a skillet on the stove to cook scrambled eggs is an example of which heat transfer? give more examples of this type of heat transferusing a space heater to heat up a cold room is an example of which heat transfer? a.conduction b.convection c.radiation d.none of these give more examples of this type of heat transfer