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.
Garchomp is a dual-typed Dragon/Ground dragon-landshark Pokemon. It has the ability Sand Veil, the hidden ability Rough Skin, and in it's mega form, Sand Force. Garchomp evolves from Gabite at level 48 and is the final form of Gible.