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How do you evaluate the statement: "All birds can fly"?

  1. True

  2. False

  3. Not Certain

  4. Depends on the species

The correct answer is: False

The statement "All birds can fly" is evaluated as false because there are notable exceptions among bird species that are unable to fly. For instance, ostriches, emus, and penguins are all classified as birds but have lost the ability to fly due to various evolutionary adaptations. These adaptations might include the development of stronger legs for running or swimming, rather than flying. Recognizing that not every bird can fly is essential in accurately assessing the statement. The presence of flightless birds highlights the diversity within the avian class and counters the generalization implied in the statement. Such an understanding of biological diversity is crucial in categories like taxonomy and evolutionary biology.