That said, this problem of causality in the area of neuroscience is endemic to a lot of papers that come across my desk that try to relate a particular brain structure to a type of behavior.
What confers an extraordinary value on the Sierra Nevada, in addition to its grandiose landscapes, are the numerous unique and endemic species of flora found in this area.
In spite of their small area, they have packed within them, as endemic species found nowhere else, more than 50% of all plant species and more than 42% of all vertebrates.