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.
1 Eustachian tubes are tiny tubes that connect the middle ear to the back of the nose and throat. 2  Eustachian tubes drain fluid away from the middle ear. 3  They keep fresh air flowing in and out of the ears and control air pressure in the middle ear. 4  Fresh air and the right pressure are needed so that you can hear properly.