Allen made a diagram to compare radiation and conduction. which label belongs in the area marked y?

The answer is; must involve temperature difference between substances or objects

Objects that are hotter than their surrounding emit radiation such as infrared light (which is also called heat radiation). Conduction is also a heat transfer methods in objects that allows heat to move from the hotter sytsem to the cooler system until thermal equilibrium is achieved.    

i guess that visual aids present persuasive examples to what you are presenting, some factors would be theme (does it fit with the color, information, what you are presenting), size (can you see it, is it a big enough span of data/information), and overall look of the visual aid.

hope this : )

answer: good job it's all correct !

explanation: