Chara (alga) Chara is a genus of charophyte green algae in the family Characeae. They are multicellular and superficially resemble land plants because of stem-like and leaf-like structures. They are found in fresh water, particularly in limestone areas throughout the northern temperate zone, where they grow submerged, attached to the muddy bottom.
The eustachian tube (also known as the auditory tube or the pharyngotympanic tube) joins the tympanic cavity with the nasal cavity (nasopharynx), allowing pressure to equalize between the middle ear and throat.
A tube called the Eustachian tube connects the middle ear to the interior of the pharynx. The Eustachian tube normalizes pressures between the middle ear and the atmosphere. What separates the middle ear from the atmosphere is the tympanic membrane.