I'm not really sure what you are asking. I will try though. The main serving sizes as you know are:
1.Small
2.Medium
3.Large
To me, it depends on the person that is ordering the food, and what size they want it to come in. I hope that helped.
Thermal energy always moves from objects with higher temperatures to objects with lower temperatures.
Yes. Either way though, humans have more chromosomes than any other species.
I think it is a, b, and e. Hope it helps! :)