no nerves transmit signals from the brain to the rest of the body, we wouldn't be able to regulate our bodies temperature let alone move or think without nerves. If you're referring to pain sensitive ones we also need a sense of pain to stay away from dangerous environments and circunstances to prevent premature death. Such as when you put your hand on a hot pot, you have an automatic reaction to move your hand off so as not to possiblely damage your body from the massive heat
Nope.
NO
yes they can. they actually used to live without humans in herds, until they were domesticated by humans and used for traveling purposes. there are still about 25,000 wild herds of horses.
yes. no.
we can not live without water, vegetables, protein and meat. Foods that we could live without are greasy foods,soft drinks and some other rich in fat and sugar foods.
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Yes humans can live with out heads if they are an zombie.
yes humans can live on jupiter
yes. they help humans food grow which helps the humans by not starving them. Without food humans could not live.If your thinking about animals, animals need plants too, so without plants humans could not live.
grass we can always live without grass
Not unaided. But this is no slight to the dwarfs; humans couldn't live on ANY other planet without substantial life support systems.
Yes.