Question

what is heat?
the flow of energy between two objects of unequal temperature
loss of energy between two objects with unequal temperatures.
when energy is created
when energy is destroyed

Explanation:

Heat is defined as the flow of energy between two objects with different temperatures. Energy is neither created nor destroyed according to the law of conservation of energy. The second option about loss of energy is inaccurate as it's a flow, not just a loss.

Answer:

The flow of energy between two objects of unequal temperature