Which topic sentence best introduces the supporting evidence in this passage? Laughter is the brain’s way of getting rid of stress caused by a weak immune system.
Grief can be very painful and is often hard for people to overcome, so they laugh often.
The hormone system is very important and functions only if people are happy.
The systems in our bodies communicate with one another, which affects health and healing.

Syllable added to a root word to change its meaning : affixan independent word--example run,walk,book : free morphemeaffix that gives grammatical meaning such as tense or number : inflectiona word part that must attach to a word in order to be usable : bound morphemedegree of comparison formed by adding -er or more to an adjective : comparativedegree of comparison formed by adding -est or most to an adjective : superlativeaffix added to the beginning of a word : prefixaffix added to the end of a word : suffixroot word of lovable : lovetwo roots used together to form one word : combining form

What story are you talking about exactly?