Final answer:
The Apollo 13 mission faced a critical CO2 filter problem due to incompatible filtration systems between the Lunar and Command Modules, which was solved by NASA engineers with an ingenious adapter.
Step-by-step explanation:
The carbon dioxide (CO2) filter problem during the Apollo 13 mission was a critical issue that needed to be solved to ensure the survival of the astronauts. Due to an explosion in an oxygen tank, the crew had to move to the Lunar Module, which had CO2 scrubbers not compatible with the Command Module's filters. NASA engineers had to devise a way to adapt the square Command Module filters to fit the round openings of the Lunar Module's system. This was ingeniously solved by creating an adapter from available materials. This example of overcoming functional fixedness was a testament to human ingenuity in space exploration.