It's not shared by every life form.
It's a **defect** shared **only** by people, chimps, gorillas, et al.
As I said in the post you're responding to:
"This makes ID quite untenable. If we were designed to need dietary ascorbic acid, why include a defective copy of the gene that synthesizes it in other mammals?"
The logic here is the same as that employed by the publishers of street maps. They typically include a few false features; if these appear on a rival publisher's maps, they have an open-and-shut case of plagiarism.
Perhaps you should post the article you are taking this from..just a suggestion- plagiarism is such an ugly thing.
So are unfounded insults.
The post was in my own words, summarizing information available on a great many web sites and also in many books on biochemistry, physiology, etc.
This is a good place to start your literature search.