Human

Human is the life state a Sim is born or created with. It can also be considered "normal" i.e. lacking a life state. Unlike the other life states, being human does not offer any pros or cons, although, that in itself, can be seen as a pro or con.

Compatibility
Unlike the other life states, if a human turns to another life state he or she will cease to be human. For example, if a vampire is attacked by a werewolf, the vampire will remain a vampire but also become a werewolf. However, if a human is attacked by a vampire the human will cease to be a human and become a full vampire.

Thus it is impossible to make human-hybrids, except in the case of aliens, but this is caused by genetics, rather than a "true" life state as in the case of a werewolf's savage or a vampire's bite neck.

Human Species
In addition to being a life state human may also refer to the human species. For example: A witch is a human who possesses the knowledge of using magical abilities. A werewolf is a human during the day. A plantsim is not a human, nor is a bigfoot. Vampires are arguably human. Some consider them to be human while some do not. Zombies are considered to be not human but they are really just a living dead human.

Biology
Humans are a bipedal, humanoid species, found in, among other areas, SimNation. Most Humans are omnivores, however certain Humans exibit hematophagy. (It has never, however, been stated as to whether the life state in question are considered human as a species). Humans have four limbs, two arms and two legs. Humans also have a large brain. So large in fact, that it takes 25% of all the carbohydrates a Human takes in daily to support it. Humans tend to be social animals, and can hallucinate if left alone for too long.

Trivia

 * In The Sims universe, humans appear to be the same species as in real life.
 * Humans are the only Life state possible to make in Create-A-Sim (unless using boolprop testingcheatsenabled in which alien and mannequin skin are available.)
 * Unlike the rest of animal kingdom, Humans (and potentially others) have the unique ability to create works of technology.
 * It is unknown if other life states are related to Humans as a species.