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.
The first competitive battler on the list, Crobat is one of the fastest PokÃ©mon in the game. The fully evolved Zubat will not sweep any teams, but is a reliable choice when you need poison and speed. #47: Heracross. This blue beetle derives its name from Hercules for good reason.