There are several in the body. You are asking about the one attached to the colon (digestive tract)? This one is often called the vermiform appendix because it looks like a worm.
There are several ideas why we have these. Some say this is "left over" as we evolved. Others say that it is important in the way that the immune system works. The last group thinks that important and helpful bacteria are found here and repopulate the intestine after many are killed during an infection. No final conclusion has been reached.
The appendix is called a vestigial organ partly because for a long time people thought that it does not perform any function in the body. It now is known however, that it is of major importance in the immune system, for example in recognising and preparing to deal with invading microbes. It also seems to be of importance in providing a seed culture of microbes to re-populate the colon after incidental major disturbances of the colon flora. It has been reduced through evolution, probably together with the reduction of the caecum.
it is because the functions that it has are not very significant to the human body
An organist
A vestigial is an organ that serves no useful function in an organism.
Tissue, organ or system. Depends on what you mean by "a collection" of cells.
The appendix is currently not in use for anyone. The appendix long ago was used by humans. We all know that back in the old days, such as mideval times, the food was dirty. The appendix attracted the dirt and cleaned the food so the human would not die of germs inside their body. Now, the appendix can get infected and burst, releasing poison into your body. If it does, it may kill you. It is on the right side near your upper hip. If you ever have serious pains there, your appendix may be affected. If it does happen, call your doctor. They have surgeons that will remove it before it bursts.
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It's not 100% accurate to call it the "least important organ". It would be better to say that we don't know what it's for, and that it can be removed with little to no impact beyond that of the surgery itself. It's at least possible the appendix has some minor function that we don't understand (one hypothesis is that it's a strategic reserve of beneficial gut bacteria, so that it can serve as a source for recolonization if the intestinal flora are cleared out by illness).
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organ loft
Vestigial organs. These are remnants of structures that had important functions in our evolutionary past but are no longer needed in modern humans. Examples include the appendix and wisdom teeth.
An organist
an organ system
an organ system
An organist
If you are still under your doctors care it would be best to ask your doctor or call his office. ANSWER i had my appendix out about a month ago and am not allowed to do physical activities for a month
WE call it chloroplast. That is where photosynthesis is happening.
Penis and testicles.
A hair cut!