Question

the rainwater that flows down a trees trunk, called stemflow, plays a vital role in carrying nutrients to the soil at the base of the tree. ecologists delphis levia jr. and ethan frost conducted a comprehensive review of available stemflow research in order to identify where the ecological role of stemflow is not fully understood. their review revealed a general consensus on many factors that affect stemflow chemistry, including tree canopy structure and weather conditions, but also exposed knowledge gaps; for instance, they noted that relatively little is known about stemflow composition and nutrient cycling in vegetation growing in forest understories. what does the text most strongly suggest is an outcome levia jr. and frost hope to achieve with their review? a there is greater public recognition that tree canopy structure and weather conditions are the factors that most significantly influence the chemistry of stemflow. b ongoing stemflow studies begin to broaden from what has been an overly narrow focus on quantifying the enrichment provided to soil. c ecologists shift attention away from factors that may turn out to have little effect on stemflow to respond to factors known to have a strong effect. d future research is guided by an awareness of what is already well understood about stemflow and what has yet to be adequately addressed.

Explanation:

The text mentions that their review revealed a general consensus on many factors affecting stem - flow chemistry including tree canopy structure and weather conditions, but also exposed knowledge gaps. It implies that there are aspects about stem - flow that have not been adequately studied yet.

Answer:

D. Future research is guided by an awareness of what is already well understood about stemflow and what has yet to be adequately addressed.