The Na'vi have special organs (similar to kidneys) called wichow that take advantage of this atmosphere to extract greater amounts of oxygen for their bloodstream. These organs use carbon dioxide and water in their bodies and convert them into methane and oxygen.
They briefly touch on this in the movie but I wish they elaborated a bit more on it. Humans can last 10 seconds breathing na'vi air, but na'vi can breathe human air for much longer than that but they still at some point need a mask to help them breathe regular human air.
Pandora's air is unbreathable due to high levels of carbon dioxide and trace amounts of hydrogen sulfide, posing a threat to humans. Humans use exopacks and avatar bodies to survive and explore Pandora's toxic atmosphere, but these solutions have limitations and challenges.
Kiri is the biological reincarnation of Grace and everything that Grace was before she was shot by Colonel Quaritch. Through Eywa, Grace's memories and consciousness were imprinted on an embryo inside her avatar body. This close connection with Eywa allows Kiri to adapt effortlessly to the ocean.
Unless that theory is true, Grace was impregnated by someone. Kiri's brothers joke that the scientist Norm could be her father. The movie does not reveal much information about the birth of Kiri. It is unclear whether Kiri was conceived before Grace died and her avatar carried her to term.
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Why can Kiri hear Eywa?
She explains that Eywa is so close to her that she can hear Eywa's breath and heartbeat. Compared to her siblings, Kiri adapted much more quickly to the free-diving lifestyle of the Metkayina and experiences little to no trouble staying underwater for long periods of time despite a lack of training.
Kate Winslet reportedly held her breath for seven minutes and 15 seconds on set for Avatar: The Way of Water. Some of the movie's scenes were filmed underwater. It's a remarkable feat; anyone (including professional freedivers) would acknowledge that a breath hold over seven minutes is extremely difficult.
Pandora's air is unbreathable due to high levels of carbon dioxide and trace amounts of hydrogen sulfide, posing a threat to humans. Humans use exopacks and avatar bodies to survive and explore Pandora's toxic atmosphere, but these solutions have limitations and challenges.
The Na'vi are monogamous creatures that mate for life. Na'vi reproduction is similar to that of placental mammals on Earth. A Na'vi female will typically produce from one to ten offspring, often spaced widely apart in time. Na'vi females have two breasts, and nurse their infants for up to four months.
Earth is divided to various nation-states and regions of the planet belonging to ever-shrinking forests and national parks. Earth was once fertile but by the 22nd century production consisted of protein farms.
Because it's set so far in the future, humans have improved their ability to space travel, which is fortunate, because Pandora is a reported 4.37 light years away, as the film depicts it being in the Alpha Centauri A system.
Lifespan. Although lifespan data is incomplete, it is estimated Na'vi live 30% longer than the average human. Once born, Na'vi children mature more rapidly than humans.
In Avatar, the Na'vi are an indigenous species that live on Pandora. They are humanoid in appearance and are 9 to 10 feet (2.7 to 3.0 m) tall, having pairs of eyes, ears, arms, legs and feet like humans, as well as a nose, a mouth, and expressions recognizable to humans.
No, humans cannot live comfortably in a 35% oxygen environment. While the current level of atmospheric oxygen on Earth is around 21%, there have been periods in the past where the oxygen levels were higher, up to 35% or more.
NEYTIRI IS A BEAUTIFUL NA'VI PRINCESS WITH IRIDESCENT BLUE SKIN, FELINE FEATURES AND HUMAN LIKE INTELLIGENCE. At three metres tall, she is long and lithe with the strength of three men.
Kiri harnesses this power when the family joins the Metkayina tribe. She's able to breathe underwater and adapt faster. Kiri also bonds with aquatic life, which is why the finale has her using plants underwater to kill human attackers.
The longest instance of someone holding their breath without inhaling pure oxygen beforehand is 11 minutes and 34 seconds. However, most people can only safely hold their breath for 1 to 2 minutes. The amount of time you can comfortably and safely hold your breath depends on your specific body and genetics.
The reference implies that a Na'vi's queue may be considered an intimate area of the body. Removing the queue of Pandoran wildlife has been shown to have severe effects. Despite this, It is unknown what would canonically happen if a Na'vi queue was cut off, but it is still implied to be serious.
Jake Sully, ex-Marine, is recruited into the RDA's Avatar program after his scientist twin-brother, Tommy, is killed. Since Jake and Tommy share identical DNA make-up, Jake is able to step into his deceased brother's role as an Avatar driver.
Augustine's colleague Norm Spellman (Joel David Moore) was the father and Grace conceived Kiri before the end of Avatar before somehow giving birth in her Avatar body. However, the more interesting theory is that Kiri is literally the child of Eywa due to some sort of immaculate conception.
Kiri is the inquisitive and intelligent adopted daughter of Jake Sully and Neytiri. Not long after Grace Augustine's death, her dormant avatar was discovered to be pregnant, and Jake and Neytiri adopted the child when she was born.
A deleted scene from the end of Avatar (2009) revealed that Neytiri was pregnant, so Neteyam was born shortly after the events of the original movie. In accordance with the sequel's timeline, Jake and Neytiri's son Neteyam is nearly 15 years old in Avatar: The Way of Water.
