What's 'range of natural variability'?
a. The range of natural variability refers to the range within which a particular natural system typically fluctuates.
b. The range of natural variability is the variation in a specific variable or parameter within a natural environment over time.
c. The range of natural variability is the spectrum of natural conditions and processes within which a particular species or ecosystem can thrive.
d. The range of natural variability represents the typical variation in a natural system that is not significantly impacted by human activities.