What do we all need to breathe which connects the concepts of "photographic equipment" and "companion", based on the etymology of their synonyms?
I'm assuming the answer is
Based on the previous answer explanations
Camera comes from the Greek KAMARA meaning ROOM. Comrade also comes from the Greek KAMARA meaning ROOM.
For example the old saying, "I need some room to breathe." or "Give me some room to breathe."
"photographic equipment" refers to
"companion" refers to
So we've got a couple of cognates; how does that connect to what we all need to breathe?
The best option I can find is CARBON. Not etymologically connected, it seems, but a vaguely similar word, and the chemical symbol is C which stands for "camera".
O2 because "chamber" and "comrade" (sharing the same room) both might refer to carbon dioxide, but the close companion of it (remaining in the context) is O2. This fulfills the phrasing "need to breathe" too. (Also, if people share the same room there will be more Co2, less O2, they will need more O2).
maybe I overcomplicated it, and it is just
if "need to breathe" means a negative consequence of staying in the same room together.