Question

What project was a significant step in cooperating space

missions?
the Apollo Soyuz Test Project in 1975
the building of an international space station
the launch of Sputnik in 1957

Answer 1

The Apollo Soyuz Test Project in 1975 was a significant step in cooperating space missions.

Step-by-step explanation:

The project that was a significant step in cooperating space missions was the Apollo Soyuz Test Project in 1975. This project involved a joint mission between the United States and the Soviet Union. The goal was to test compatibility and communication between the American Apollo spacecraft and the Soviet Soyuz spacecraft.

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