(a) (i) What is meant by vestigial structures?(ii) Give an example of a vestigial structure in human.(b) Explain why certain drugs become ineffective in curing a disease after many years of use.
Answer Text: a)(i)- Structures that are greatly reduced in size and therefore cease to function.ii) Examples : human appendix, kiwi (flightless bird) with reduced wings, vestigial wings in flies, human hair,presence of hind limbs inpython,reduced pelvic girdle in whale.b)- Disease causing organisms mutate and become resistant after repeated use of drugs hence survive the drugs. They then transmit this characteristics to their offspring, and drugs fail to eradicate them
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