Board Thread:General Discussion/@comment-27441478-20160730084258/@comment-27441478-20160731221919

Remember, P.S as much as the Bio-lizard was just a scientific experimental test bed. Maria died regardless whether she had an incurable disease. Maybe Gerald Robotnik when trying to find a cure went the full monty and tried to find a way of immortality etc. through different experiments. Also note that Shadow was eventually also made as a weapon of revenge against humanity after Maria died.

Based on the theory, biologically, Shadow probably has all the organs and whatnot to keep his body functioning like any other organism, but only keeping those which are necessary. For example theoretically, his body might not contain a stomach or kidneys due to the fact he does not need to eat or proccess food or drink (due to the fact he cannot starve to death etc.). This should also be relevant to other bodily functions considered uneccesary by the creator.