When people do this they put their heads so close together that they practically breathe each other's air. what is one word to describe that?

Well I doubt this is right, but based on the vocabulary packet this question came from I would say that the word is conspire.

Explanation:

henry david thoreau and ralph warren emerson earned the name transcendentalists.you could assume that transcendentalists come from a well educated background from people that were alive before the american civil war.these people, mostly new englanders, mostly around boston, were attempting to create a uniquely american body of literature. it was already decades since the americans had won independence from england. and so they deliberately went about creating literature, essays, novels, philosophy, poetry, and other writing that were clearly different from anything from england, france, germany, or any other european nation.another way to look at the transcendentalists is to see them as a generation of people struggling to define spirituality and religion in a way that took into account the new understandings their age made available.