as I like to point out in this kind of situations, are parts of my own human body;
*points to pink little part on the inner part of the eye* this is a remnant of a third eyelid, something possessed by reptiles, amphibians, and some mammals. Dogs and cats, for example, have semi-functional third eyelids, which can be seen functioning especially when they sleep. Because we humans have had little use for a third eyelid beyond another way of removing dirt from our eye, evolution has caused the muscles controlling our third eyelid to mostly deteriorate, which is why we cant use it.
*points to the wisdom teeth in the back of mouth* These are from back when our ancestors had larger jaws that could fit the extra wisdom teeth, as the larger jaws with more molars was better fitted for eating plants, which our ancestors ate much more of. Today, do to these herbivore ancestors mating with the stronger, more aggressive carnivore ancestors, it produced our smaller jaws. This is why the majority of people need their molars removed, because the can't fit on our smaller jaws, and as a result often even grow in sideways. Evolutions is even just now causing some people to be born without wisdom teeth, a next step in evolution.
*points to ears* Have you ever seen people who can wiggle their ears? Thats because our ancestors used to be able to move their ears around, similar to how many animals do. they moved their ears so they could better locate where a sound is coming from. But as this skill became less necessary to our ancestors, evolution caused this ability to deteriorate away for the most part, tho some people can still partially move their ears.
*points to stomach* The appendex used to be used by our herbivore ancestors to better digest plants by breaking down the cellulose. However, as we became more omnivorous, we had less desperate for eating plants since we had meat, and thus it wasn't as important for us to be able to fully digest plant material. Because of this fact that we didn't need a full function appendex, evolution caused the appendex to deteriorate to the point where today, it is a useless organ that 1/3rd of people have to have removed because of rupturing.
--tho ofcourse, he still won't listen. Cult followers are dedicated to their cult, and nothing short of beating them senseless will change that. -Tho despite common conseption, cult followers are statistically just as intellegent and sane as other people; its just that they fell into a wrong crowd, and the brainwashing effect did its work.