40bb6223____NASA_Quest___Archives_____Source
[Condition] companionship [How Helpful] to keep the animals happy and maybe to keep them from being scared [Source] 
other lab. rats
s w i t c h i n c a b i n
c a b i n
f a n
t u b e
c a b i n , t h e r m o m e t e r i n h a b i t a t t o c h e c k
m i s t e r
w h e e l
o t h e r l a b . r a t s
a n i m a l s t h e m s e l v e s a n d r o o m
s p e c i a l c o m p a r t m e n t c h a r c o a l o r s o m e o t h e r a b s o r b e n t m a t e r i a l
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