اب آخری اعتراض کہ جو ابتدا میں وارد کیا گیا کہ کیا کسی بھی مخلوق کا اپنی عام طبعی عمر سے کہیں زیادہ زندہ رہنا ممکن ہے اسکا جواب بھی ہم سائنس میں ڈھونڈھتے ہیں . What we're talking about here is "biological immortality", although many biologists would probably rather we didn't use the phrase. Biologically immortal organisms do die, but they don't seem to age"Immortal really means you don't die at all, which is stupid," saysThomas Bosch at the University of Kiel, Germany. Paradoxical though it might seem, biologically immortal organisms are definitely mortal. They can be killed by a predator, a disease, or a catastrophic change in the environment such as an erupting volcano. But unlike humans, they rarely die simply because they get old.To put it another way, biologically immortal organisms do die, but they don't seem to age. They're basically the exact opposite of Tithonus. A Rocky Mountain bristlecone pine (Pinus aristata) (Credit: David Welling/NPL) The bristlecone pine is a good example. Some of these North American trees are astonishingly old. They began growing 5000 years ago: about the time the real city of Troy was founded in what is now Turkey.