Anatomy of Sims

on Wikipedia.

Anatomy is a branch of biology and medicine that is the consideration of the structure of living things. This page is for the study of the anatomy of Sims.

Sims
Sims are a bipedal, humanoid species[1], found in SimNation. Most Sims are omnivores, however certain Sims exhibit hematophagy and vegetarianism. Sims have four limbs, two arms and two legs. It is unclear how intelligent Sims are; although they have the ability to use tools and create works of technology, they lack direction and often require a guiding hand, that of the player, to manage some of the simplest of tasks. Sims tend to be social creatures, and can hallucinate if left alone for too long.

Organs
Sims are based on humans, so its safe to believe their organs are similar(except for, well you'll know if you edit male's skins). Zombies will often think about brains, (almost) proving that Sims have brains. The proof that Sims have brains come with the small text displayed when you receive the certificate for achieving level 10 in logic in The Sims 3. They urinate the same way as humans, and their bladders are filled when food is eaten. This shows that Sims have a digestive system.

Sims' skins are proven to be sensitive to the sun. Sims also seem to have an immune system, as they are able to cure some diseases by simply resting, though some diseases are more serious and can result in death. Vampirism is a unique life state which acts as a virus, which Sims can easily be cured of. Their blood, plasma, is not too different from human blood, with similar classes such as o-positive. Dominant and recessive genes also exist in Sim DNA. Also, in The Sims 3, if Sims dye their hair, it will affect their genetics. Sims' brains seem to allow them to sleep on command, as it take seconds for them to fall asleep, whereas humans normally take at least five minutes to fall asleep.

Evolution
One of the biggest differences between Sims and humans is the pace of evolution. Where a human could take millions of years to obtain characteristics which would differ from today's humans, Sims could take less then 25 (in-game) years. One of the most notable examples of Sim evolution could be aging. In The Sims 3, a full life cycle is present. However, in The Sims, almost the entire aging cycle was undeveloped, but 25 years later, in The Sims 2, the system is restored. In The Sims 3, moodlets, traits, wishes, and their lifetime wish make up how they live their lives. In The Sims, characteristics of Sims include a Sim's needs, which affect their Mood; Personality, Zodiac signs, Interests, and Age, which affect the Interactions a Sim can perform; and Relationships, Employment, Education, and Skills, which determine how well Sims perform certain tasks. Most of the characteristics they had 25 years ago were lost. In The Sims 2, Sims have developed Wants and Fears, Aspirations, Hobbies and turn ons/offs.