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yes. no.
Yes humans can live with out heads if they are an zombie.
grass we can always live without grass
Yes.
No, humans cannot live without establishing a harmonious connection with the ecosystems in the oceans.
no our brain will dry out
Yes.
Nope.
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.
no.
Humans can't live without energy - they have always used energy.
NO