In restoration ecology, why might it be challenging to return a damaged ecosystem to original its state/function? why do scientists often select watersheds as an area to study energy and matter flows in'ecosystems?

The answer to your question is d. convection currents. hope this you.

Literature had become much more popular and advanced  , and narratives about human behavior, instead of philosophy and religion were being focused on much more . different books about medicinal things were also written , which focused  on surgery and groundbreaking advances in the  procedures of lifesaving practices.