Answer:
A question about why a behavior occurs relates to ultimate causation.
A learned behavior is shaped by experiences.
If an animals experience during development does not influence a response, the response is most likely an innate behavior.
A fixed action pattern is an example of innate behavior.
A learned behavior can vary widely within a species.
A scientist who questions the evolutionary history that a given behavior relates to is investigating its ultimate causation.
An action that is observed in embryos is an innate behavior.
A scientist examining the mechanism of a particular behavior is studying proximate causation.