A couple of these could be in error. Recent hypotheses are that the appendix performs the useful service of being a reservoir of the intestinal flora essential to digestion. Since food poisoning and other bowel problems are common in the wild, this could have been vital in maximizing food nutrition.
And recent discoveries are also casting into doubt the label of “junk DNA”, which may not be so useless after all, but perform critical protein control functions.
> And recent discoveries are also casting into doubt the
> label of “junk DNA”, which may not be so useless after
> all, but perform critical protein control functions.
I wouldn’t be surprised if large sections of the genome currently considered “junk” didn’t have some usefulness. There are some bits, though, like the broken piece that used to allow our ancestors to synthesize vitamin C, that probably deserve the label “junk”.