Why dose laughter seem to qualify as a biological function?

Laughter is part of the universal human vocabulary. All members of the human species understand it. Unlike English or French or Swahili, we don’t have to learn to speak it. We’re born with the capacity to laugh.

One of the remarkable things about laughter is that it occurs unconsciously. You don’t decide to do it. While we can consciously inhibit it, we don’t consciously produce laughter. That’s why it’s very hard to laugh on command or to fake laughter. (Don’t take my word for it: Ask a friend to laugh on the spot.)

1) technical language (writen technical volcabulary)

2) ordinary langauge

3) literary language (because it's text with a rich, descriptive vocabulary)

4) scientific texts (includes texts such as medical reports, legal texts, academic journals, etc)

5) informational texts (texts that are used to convey information to readers, such as technical guides, costumer guides, textbooks)

6) poetic texts. because they are essays, short stories, poems, etc.