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| Q. |
Which of the following are difficult to explain in terms of natural selection? |
| A. | Male peacocks evolve tail feathers that would appear to make them more rather than less vulnerable to predators. |
| B. | Male deer evolve antlers that are not used to defend themselves against predators. |
| C. | A bird issues a warning cry that puts it at greater risk of being noticed by a predator. |
| D. | Some traits appear to have no adaptive value. |
| Answer» D. Some traits appear to have no adaptive value. | |
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