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.

blood inside our bodies is blue, but it turns red when exposed to oxygen. Both deoxygenated (venous) blood and fully oxygenated (arterial) blood are red. Blood in the veins appears blue for a number of reasons.

Share on Pinterest It is a myth that deoxygenated blood is blue; all blood in the human body is red. Human blood contains hemoglobin, which is a complex protein molecule in red blood cells. Hemoglobin contains iron. The iron reacts with oxygen, giving blood its red color.

Tardigrades

Some modern species may possess biological immortality. Certain scientists, futurists, and philosophers have theorized about the immortality of the human body, with some suggesting that human immortality may be achievable in the first few decades of the 21st century.

Studies in the biodemography of human longevity indicate a late-life mortality deceleration law: that death rates level off at advanced ages to a late-life mortality plateau. That is, there is no fixed upper limit to human longevity, or fixed maximal human lifespan.

Emilio Flores Márquez

Emma Martina Luigia Morano OMRI (29 November 1899 – 15 April 2017) was an Italian supercentenarian who, before her death at the age of 117 years and 137 days, was the world’s oldest living person whose age had been verified, and the last living person to have been verified as being born in the 1800s.

Emma Morano, the last known person alive who was born in the 1800s, has celebrated her 117th birthday. Born on 29 November 1899, four years before the Wright brothers first took to the air, she is the world’s oldest living person.