In hybrids with other sapient species, this adaptability lessens or completely removes any inherited weaknesses.Īnother one of humanity’s greatest strengths is adaptation, they can acclimatize to environments with lower oxygen and withstand temperature degrees higher and lower than their homeostasis level. Injuries such as broken limbs or large lacerations are often death sentences for other species, while Humans often live several years after receiving similar injuries, although thanks to their hyperactive scar tissue, they are left with nasty scars. Even when compared to other Terran pursuit predators like wolves, a Human's endurance is massive. Being pursuit predators by nature, Humans have several adaptations for such a lifestyle, such as sweat glands, and being mostly bare of hair. Humanity's greatest strength is their endurance. Despite having teeth not as sharp like those of their evolutionary relatives, the other Earth primates, their jaws are much stronger and are able to apply the force of over 1,000 Newtons in a single bite. A Human following you with a rock is extremely dangerous. They can, however throw objects with unusual strength and accuracy, and an athletic Human is a tireless runner.

Their fingers and toes have nails, rather than sharp claws. However, Humans have also developed sufficiently to perform tasks using their feet as a matter of choice and need in place of the hands where absent.ĭespite having evolved as an opportunistic feeder species (being able to gather, hunt, scavenge, or raise food), Humans are generally considered weak and not well adapted to hunt without the aid of tools. Human feet evolved from a second pair of hands, which can bear the Human's weight, but cannot perform any of the actions of the true hands. Humans balance vertically on their legs, and Human knees bend backwards. Hand are intricate arrangements of five miniature limbs that can be used as grapples, tweezers, clusters of feelers, baskets or semaphore machines, giving them a highly effective way to grasp and manipulate objects as opposed other adaptations such as claws or tentacles (Aliens unfamiliar with humanoid hands often mistake human hands for symbiotic lifeforms on first contact: hands appear to have four limbs and a head, like the main body of the human the hands operate machinery and perform all the recognizably intelligent actions, and the hands attempt to communicate in some sort of interpretive dance.) Humans have two pairs of limbs, the lower pair adapted for bipedal walking ( legs) and the upper for carrying ( arms). Their circulatory system is closed and they have a heart and two lungs (though they are able to survive with only one lung), located in the chest area. More than 60% of the Human body is composed of liquid water.

Humans are carbon-based lifeforms, and have an internal skeleton containing calcium phosphate, which gives the bones strength and durability. Vulcans, for example, have green blood containing copper, while the Human blood is red and contains iron.Ĭonstituents of the human body in a person weighing 60 kg Although some humanoid races look almost exactly like humans (due to convergent evolution or another unknown factor), as is the case with Vulcans, they are often very different internally. Extraterrestrial species showing this same body plan, or a very similar one, are collectively known as humanoids. Humans have an erect posture, with two legs, two arms and a head which comprises the brain and most of the sense organs.

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