Shaomu said: She's more likely to weigh at least half a ton, probably two. Androids can't be as light as people, metals are heavier.
Well, that's provided their composition IS metal. Transporting such a piece of equipment would be troublesome, so I'm a lot more willing to bet futuristic ceramics and plastic.
Well rhetorical at best but... Science keeps the organic bits and pieces from rotting away.
If you want a canon answer; I can simply reply I do not know, partially due in part to me not knowing which series this is from. In a scientific standpoint, however, I'd assume the tissue are kept alive through some sort of method, possibly electrical synapse replication, tricking the cells into thinking the host is still alive; compounds and other forms of nutrition are then circulated through an artificial blood stream to maintain the flesh as needed.
I have to cringe a little at the acceptance of that explanation. Just because tissue is cloned does not mean it is not susceptible to the same wear and tear as the original. If it's not heavily modified, cloned tissue will rot just as fast and easily as the original. Cloning isn't magic, it's basically just taking an existing sample of tissue or genetic information, and giving it plenty of food and a safe place to grow and divide until there's enough of it to be used. Cloning an complex structure like an organ or even a complete organism isn't that much different. Maybe they do things differently in the Xenosaga-verse, I only watched the anime (Found it sub-par btw). On an unrelated note, none of this would keep me from boning her organic bits.