A curve on a graph that records the situation
The genetic combination of their parents.
After reading the above information, one reason different members of crow populations have a different rate of survival is there is always a chance that that some other variation will also effect some of the crows ability to survive. Another reason is that the vision, muscle strength and size can influence survival.
Linnaeus. Carolus Linnnaeus is a Swedish naturalist whose lasting achievement is binomial nomenclature; it is a system of naming and classifying plants and animals according to genus and species.
