2) sometimes insects will instead sit on top of a warm surface in order to increase their body temperature. what is the primary type of heat transfer are they using t?

a) radiation b) convection c) conduction

The correct option is C.

Explanation:

There are three modes of heat conduction, these are conduction, convection and radiation. Heat transfer by conduction usually involves the movement of heat through solid substances. For instance, in the scenario given in this question, the warm surface is the solid substance through which heat is passed to the insects' bodies. Thus, conduction requires direct contact.

Heat transfer by convection method usually involves the movement of heat through liquids or gases while radiation can occur in vacuum.

the glands which are associated with each description is given below: