a life factor is something or an event that affects a person's life, either positively or negatively.
temperature
Yes a parasite affects an organism's homeostasis
air presure
humidity
Fishing is a factor that affects aquatic life in the ocean. So is water pollution.
Variable
Variable
Variable
Variable
Oxygen is a factor that affects burning. Another factor that affects burning is the material that is burning. If the material isn't combustible, it won't burn.
The availability of water is the critical factor.
Oxygen
Vegetation
phrase
the organism
Ripeness