Bacteria (/ b Ã¦ k Ë t ÉªÉr i É / ( listen); common noun bacteria, singular bacterium) constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria have a number of shapes, ranging from spheres to rods and spirals.
junk food. n. (Cookery) food that is low in nutritional value, often highly processed or ready-prepared, and eaten instead of or in addition to well-balanced meals. junkâ² food`. n. 1. food, as potato chips or candy, that is high in calories but of little nutritional value. 2. anything that is attractive or diverting but of negligible substance.
Space Junk redirects here. For other uses, see Space Junk (disambiguation). A computer-generated image representing space debris as seen from high Earth orbit (HEO). The two main debris fields are the ring of objects in geosynchronous Earth orbit (GEO) and the cloud of objects in low Earth orbit (LEO).