A two year old can memorize faces, colors, social emotion, words and movement. They can actually memorize a lot for their small age. Of course they can't remember big details and such but they still can recognize small details.
Food..........................
A. Lungs because thats your respiratory system
It seems like it wold be all of the above
True - think of it this way when we smell something nice or a family member dies or something Jurassic happens what do you feel joyed, depressed etc.