3. If vestigial structures, such as hip bones in dolphins, have no current function, then why does natural selection allow them to remain? Explain.
Answers
Answer:
Explanation:
Structures that have no apparent function and appear to be residual parts from a past ancestor are called vestigial structures.
Examples of vestigial structures include the human appendix, the pelvic bone of a snake, and the wings of flightless birds.
Vestigial structures can become detrimental, but in most cases these structures are harmless; however, these structures, like any other structure, require extra energy and are at risk for disease.
Vestigial structures, especially non-harmful ones, take a long time to be phased out since eliminating them would require major alterations that could result in negative side effects.
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ANSWER:
Genetically defined traits or characteristics that, in a particular species, have mostly or completely lost the role they once served.
EXPLANATION:
• Vestigial structures frequently resemble those in other species that perform their usual functions. Consequently, vestiges of structures might serve as proof of evolution.
• Although many of these kinds of structures would eventually vanish over many generations, some of them continue to be passed down to offspring because they either don't harm the species or have developed new functions through time. Some only exist or function during the embryonic stage of foetal development, or perhaps they simply cease to exist as we age.
• Examples of vestigial organs are – ear muscle, third molar, appendix etc.
Therefore, though certain vestigial structures do not have a function, still natural selection allows them to persist because they serve in the study of evolution.
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