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/she will cease to be human. i.e. If a Vampire is attacked by a werewolf, the vampire will remain a vampire, and 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, instead of the human life state. 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 would consider them Human, while others would consider them non-human.

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