Advantages of both the nervous and endocrine system

"The nervous system makes rapid adjustments to environmental stimuli, while the endocrine system generally makes slower, longer-lasting adjustments." 

Maybe when an organism has both an endocrine and a nervous system it is able to not only make rapid changes to be more well-adjusted in its environment but is also able to make changes required for survival in long-term.

Hope that helps:))

This type of galaxy is an approximately ellipsoidal shape and a smooth, nearly featureless image. they are the largest single star systems, in the universe and are built by the collisions of many smaller galaxies.

A. radioactive dating