If a few teeth of intermediate size and shape make “the most complete chain of human evolution,” then the evidence for human evolution must be quite modest.
Megalodon was a specialized apex predator and fed mainly on large baleen whales.
One-third of minerals — chemical solids whose atoms are highly ordered — are created directly or indirectly by life forms.
They propose the term “biological role” instead. Thus, presumably, “the function of teeth is chewing” becomes “the biological role of teeth is chewing.”
If redwoods are a byword for great stature, grasshoppers represent the opposite. And what insect could be more common or familiar?