vestigal organs are
Primordial organs
primitive organs
organs reduced due to disuse
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ANSWER:- Organs no more in use but were once used by our ancestors are called vestigial organs. The human body has a lot of vestigial organs that are no more used, e.g., vermiform appendix, Plica luminaries, etc. The most probable explanation for these organ changes in the environmental conditions which brought about corresponding changes in the human body.
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