bees
... that as flowers developed longer tubes, bees coevolved by developing longer tongues to extract the nectar?
... that as flowers developed longer tubes, <b id="mwB70"><a href="./Bee" id="mwB74" rel="mw:WikiLink" title="Bee">bees</a></b> <i id="mwB78">(pictured)</i> <a href="./Coevolution" id="mwB8A" rel="mw:WikiLink" title="Coevolution">coevolved</a> by developing longer tongues to extract the <a href="./Nectar" id="mwB8E" rel="mw:WikiLink" title="Nectar">nectar</a>?