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One that does not serve a function within the body. For an example, the appendix.
YOu were born with one & if it hasnt been removed you have an appendix.
you dont, your born with one.
The reason we have an appendix is unknown. I twas once thought that it could have helped our ancestors digest food more easily.The reason for our (humans) appendix is unclear. It may produce bacteria to fight off illness.
An appendectomy is not always the best course for an inflamed appendix. a burst one, for sure, but if it’s caught in the right stages, antibiotic treatment can be as effective and much less costly both financially and physically. The appendix is not vestigial or useless contrary to popular opinion.
Some individuals in the past believed what is quoted below "The appendix servers absolutely no purpose to humans and haven't done so in thousands of years. In fact, the appendix can easily kill you, but it can not help you in any way, ever!" New research is showing that the appendix can actually be a safe haven for beneficial bacteria that promotes healthy intestinal function. However, when the opening of the appendix into the cecum becomes blocked then a nasty appendicitis can occur.
There are two types of appendices. One is the appendix found in a human body and the other is the appendix found at the end of a book. The appendix in the human body is widely accepted as a seemingly useless organ. Scientists have yet to find an explicit purpose for the appendix. Today most scientists believe it produces and stores bacteria that is useful to your body. The appendix found at the end of a document often serves as an addition to the text. This addition has information that is relevant to the text but not focused on the topic of the text.
A person only has one appendix. There is no known function of the appendix in humans.
No, you do not have more than one appendix.
We use the term "vestigial organs" for structures that may have had a purpose at one point in our evolutionary development but no longer seem to suit any purpose.
The most obvious answer is no; millions of people have had their appendix removed without ill effects. Darwin suggested that the appendix is a leftover from when our ancestors used to digest leaves. Recently, it's been suggested that the appendix is used to keep bacteria that keep the colon in good order, however it doesn't seem to cause a problem to have it removed. Given that it's seems largely useless and a burst appendix used to be a fatal disorder, one might ask why it's survived at all. One theory is that a smaller appendix is more prone to bursting so it's reached a sort of happy medium value.
They all have an appendix. Liam Payne only has one functioning kidney.