Why does laughter seem to qualify as a biological functions?

Answer/Explanation:

­Philosopher John Morreall believes that the first human laughter may have begun as a g­esture of shared relief at the passing of danger. And since the relaxation that results from a bout of laughter inhibits the biological fight-or-flight response, laughter may indicate trust in one's companions.

the consumer demand because the members have to be aware if people are going to buy what they want to sell in this case either energy drinks or a car wash.