This is the 1000th most frequent Greek word.
φυσικό
"Φυσικό" means "natural" or "physical" in English.
Here, 'φυσικό' means 'natural' and refers to attributes of the environment.
Το φυσικό περιβάλλον είναι σημαντικό για την επιβίωση μας.
The natural environment is important for our survival.
In this case, 'φυσική', a derivative of 'φυσικό', refers to 'physical', describing the bodily health and condition.
Η φυσική κατάσταση του αθλητή βελτιώνεται καθημερινά.
The athlete's physical condition improves daily.
In this sentence, 'φυσικό' means 'natural' in the sense of being expected or normal.