Original sentence: An example of the dispute is the gas bladder of many fish, which is thought to be a vestigial lung, "left over" from the occasionally-air-gasping common ancestor of ray-finned fish and land vertebrates.Because vestigial organs are used as supporting evidence for evolution, creationists vigorously oppose the idea.Others claim that an organ in a modern animal may be described as vestigial if it does not serve the same function in the modern animal as the cognate organ served in an ancestor, even if the modern organ serves a completely different use.Some debate occurs regarding the definition for "vestigial", with some claiming a strict interpretation that an organ must be utterly useless to classify
Edited sentence: An example is the gas bladder of many fish, which is thought to be a vestigial lung, "left over" from the occasionally-air-gasping common ancestor of ray-finned fish and land vertebrates.Because vestigial organs are used as supporting evidence for evolution, creationists have vigorously attacked the idea, claiming that for an organ to be "vestigial" it must be utterly useless.This is a misrepresentation: an organ in a modern animal may be described as vestigial if it does not serve the same function in the modern animal as the cognate organ served in an ancestor, even if the modern organ serves a completely different use