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twenty nations.
Osixteen nations.
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Astronauts and scientists conduct research studies aboard the International Space Station, a satellite that was built by
O the United Nations.
the United States.
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Answer 1

The question subject is Social Studies and it asks about the countries involved in building the International Space Station.

Step-by-step explanation:

The subject of this question is social studies. It is asking about the International Space Station and the nations that were involved in building it. Astronauts and scientists from different countries conduct research studies aboard the space station.

Learn more about The International Space Station and the nations involved