Likely a sterile medium means an uncontaminated culture (food free of living organisms) that will grow only the new bacteria introduced for analysis. Source(s): http://www.thefreedictionary.com/sterile
Stonepelt was Bluestar's first mentor and a very well-respected senior warrior of ThunderClan. It is revealed in this book that he took her to the Gathering on her second day as an apprentice because she had caught a squirrel very well for a new apprentice, and the squirrel had been as big as she was.
Cindercloud said: Please rate my warrior names: Breezewing: white tabby she cat with blue eyes. Pebblewhisker: dark gray tom with amber eyes. Ashcloud: pale gray tabby she cat with blue eyes. Badgerstripe: black tom with white stipe down back. Mapletail: light brown tom with dark brown flecks.