Question

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Answer 1

1. The human does not eat cellulose and hence he has smaller appendix.
2. “Vestigial organs are the organs that have no apparent function and are considered to be the residual parts from the past ancestors.” But the thumb is most useful organ. hence it is not vestigial organ.
3. Wisdom teeth are considered a vestigial organ -- no longer useful -- because our diet has evolved. Early humans ate a mostly raw diet of foraged plants and hunted animals, which required a lot of rough chewing. That wore down their teeth.