Gap Fill - Astronauts' DNA - Level 0


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   ago      astronauts      cancer      chances      DNA      DNA      factors      radiation      research      space  

Paragraph 1

Our can change in . This could increase astronauts' of getting . Scientists did on astronauts' blood. The went on the Space Shuttle 20 years . They gave blood before and after going into space. A professor said and other in space could change our .

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