Immortality, Something that many people have tried to gain and so far all have failed. But outside of the Human species there may be some that have reached a form of immortality.
First lets talk about what immortality is and the different forms of it.
This is the scientific version. From the scientific side it is when an organism no longer can be killed by time. when it comes to humans there are several ideas as to how we could extend our lives, rejuvenation and mind uploading. But when it comes to things that happen in nature there are different answers. If a species mortality rate doesn't increase after maturity then it is considered biologically immortal. an example of this would be coral colonies and aspen trees. The older either of those is then the harder it is for it to die, that means that its mortality rate is higher the younger it is.
The Hydras, a species of really small fresh-water animal, scientists have recently become interested in them do to their regenerative ability. the odd thing about the Hydras is that they have the ability to to stop their aging. And while in captivity we have never seen one die from age. Many scientists think that they could open the doors to the extension of human life. Another example of something like this in nature is the Turritopsis Nutricula, also called the Immortal Jellyfish. This jellyfish has the strange ability to revert back to its infant stage after becoming sexually mature. And from what scientists can tell this action can be repeated forever thus letting it be considered immortal. Just like the Hydra people are looking into seeing if it can help people live longer.
On a new hand there are some bacteria that have been able to come out of a form of 'stasis' after millions of years.
When i mentioned Aspen colonies above, the oldest one that we know of is named Pando. Latin for "I Spread", this 'trees' age is around 80,000 years old. at this age its mortality rate is so low that many thing that a natural death for it is incredibly unlikely. This tree no longer needs to reproduce, it simply clones itself to add a new tree. The way these trees work if you dont know is the Tree is really the root system. The parts that people see are only the sprouts. Thats why if it needs to make a new 'tree' then it just clones itself and the roots sprout a new tree.
One of the oldest individual Living things we know of is a member of Pinus Logaeva, or the Great Basin Bristlecone Pine. The member is 5,063 years old. It is able to achieve this incredible age by letting the out side of the tree die to protect it from the dangers of the world. Whats more the environment in which it lives is very dry and has near no extreme weather that could damage the tree.
So is immortality real or possible or is it something that only some "Chosen" species can achieve. That said there is a chance that humans have not finished evolving, or Science will one day understand the ways that they do it and manage to imitate it. But that's for another discussion.
