### Instruction:

Extract the cause and effect entities from the following sentence:
Emergencies could result from ISS system failures, an uninhabitable crew environment, or a medical event requiring the return of the crewmembers

### Assistant:

KEYWORD: could result from
EFFECT_1: Emergencies
CAUSE_1: ISS system failures
CAUSE_2: an uninhabitable crew environment
CAUSE_3: a medical event requiring the return of the crewmembers
OR: or
VARIABLE: Emergencies
CONDITION: requiring the return of the crewmembers


### END
