2006-09-11 10:19:10 · 12 answers · asked by jin_wen_de 2 in Health ➔ Other - Health
You will need all of them unless you intend to tether everything you'll ever need to you as you float about. Pretty sure you'd suffocate or freeze if you ever floated up too high, so you'd have to tie yourself to the ground, too. This is a really stupid question. I don't know why I am answering it.
2006-09-11 10:35:01 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Well, rather than interpreting the way you may have intended--for the answer would obviously appear to be gravity--one can interpret your question as: "Which of these, if it suddenly were to not exist on Earth, would be least devastating?" And the answer to *that* is nutrients, for you could live a month or so without nutrients. (But only live several minutes without oxygen, several days without water, several minutes without atmospheric pressure, and without gravity we'd suddenly end up floating inexorably upward, because once bumped upward there is little to stop us from continuing upward into space, and so most will tend to die in the first day, except those staying indoors, and even they will die because the atmosphere will quickly disappear into space.)
2006-09-11 17:28:07 · answer #2 · answered by A professor (thus usually wrong) 3 · 0⤊ 0⤋
Gravity. Astronauts live in a very low-gravity environment and it doesn't kill them. But they usually get osteoporosis because they can't do weight-bearing exercises like on Earth.
I guess if you had an air tank and a space suit, you wouldn't need atmospheric pressure, either. Astronauts are past Earth's atmosphere, and they can go out in their space suits and it doesn't kill them, either. But the other three are necessary. For humans, anyway. I mean, anaerobic bacteria don't need oxygen. Why do you ask? Are you building a planet like in The Hitchhiker's Guide to the Galaxy and you need some guidelines?
2006-09-11 17:24:34 · answer #3 · answered by SlowClap 6 · 0⤊ 0⤋
For immediate survival, gravity is no required. We do require some oxygen, water, nutrients for metabolism, and atmospheric pressure in order to inflate our lungs. Without any one of those, we rapidly die.
There are studies that show that longterm lack of gravity results in muscle wasting and bone loss....but it is obviously not immediately terminal.
2006-09-11 17:22:04 · answer #4 · answered by essentiallysolo 7 · 0⤊ 0⤋
Gravity.
2006-09-11 17:22:28 · answer #5 · answered by Lil Red 2 · 0⤊ 0⤋
Actually, all are essential for long term survival. Certainly, we can live for periods in zero gravity environments, however the human body would be unable to fully form in a gravitational-less environment.....
Without O2, youre dead in minutes. Without water youre dead in three days. Without nutrients, youre dead in two weeks. Without atmospheric pressure, you'd be dead in milliseconds....
2006-09-11 17:26:16 · answer #6 · answered by YDoncha_Blowme 6 · 0⤊ 0⤋
Gravity. Need oxygen. Can only live three days with out water... My finial answer - Gravity.
2006-09-11 17:23:43 · answer #7 · answered by 4mom 4 · 0⤊ 0⤋
Gravity obviously.
2006-09-11 17:24:35 · answer #8 · answered by Sid 1 · 0⤊ 0⤋
Gravity is not essential. All others are. Everything except pressure is obvious, but pressure is needed to breathe, and many other vital things in our body.
2006-09-11 17:22:14 · answer #9 · answered by MrRSMan 2 · 0⤊ 0⤋
Umm, are you in the third grade? Gravity.
-Duo
2006-09-11 17:20:43 · answer #10 · answered by Duo 5 · 0⤊ 0⤋