Fermentation is a metabolic process that converts sugar to acids, gases, or alcohol. It occurs in yeast and bacteria, and also in oxygen-starved muscle cells, as in the case of lactic acid fermentation.
pupil noun [C] (EYE PART). âº the âcircular âblack âarea in the âcentre of an âeye, through which âlight âenters: Pupils âcontract in âbright âlight, and âdilate in darkness. (Definition of pupil from the Cambridge Advanced Learners Dictionary & Thesaurus Â© Cambridge University Press).
The pupil is circular opening located in the center of the iris (the colored part of the eye). It controls the amount of light that enters the eye.   It helps you see sill â¦ y. + 8 others found this useful. Sonna Ralph. Judy Olmsted. 79,172 Contributions. Retired college science professor.