By shutting down the fuel cells, what will the astronauts not be able to do while they are in space?

The fuel cells are what powers up the spacecraft with regards to its different operations like regulating breathable oxygen and making pot water. The famous incident that the fuel cells got leaked was in the Apollo 13. Their quest to the moon has come to an end when their fuel cells had gone insufficiently to continue the voyage.

3.1439 im dont think its right but im pretty sure it is

Answer after wwii, communist countries in eastern europe formed the warsaw pack, a military alliance, and comecon, an economic alliance;