1  2  3 

1  _  _  _

2  _  _  _

3  _  _  _


ACROSS
1)  a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium
2)  two items of the same kind
3)  social insect living in organized colonies; characteristically the males and fertile queen have wings during breeding season; wingless sterile females are the workers


DOWN
1)  an enzyme found in mammals that can catalyze the deamination of adenosine into inosine and ammonia
2)  a large cask especially one holding a volume equivalent to 2 butts or 252 gals
3)  be seated

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