English: Coevolution is the influence of closely associated species on each other in their evolution. Key - 1: Two different species of flower allow hummingbirds with both short and long beaks to thrive. 2: The red flower species goes extinct, causing the short-beaked birds to lose their food source, because they can’t feed on the bigger flowers. 3: The short-beaked hummingbirds are less fit, and die out, leaving only long-beaked hummingbirds.
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