<em>Mitch's brother had a sickness like Morrie's so that is one similarity. Morrie also has a younger brother like Mitch. A contrast is that Morrie knows it is okay to show your emotion ex: crying Mitch however does not......</em>
Yes, "All teenagers are mean and smelly they really need to clean up their acts." is a run on sentence.
The answer is: smell
In “Two Kinds” by Amy Tan, when the age of Old Lady Chong, the piano teacher's mother, is being describe, the author uses two similes she smells "like a baby that done something in his pants” and has skin "like an old peach" appealing to the smell sense.