IT IS PHYSICLY POSSIBLE.
think about it.
Lets say you build a dome, and you take it to mars and drill it so its a permanent base ( regardless of how much it costs to put a huge dome on mars , im talking physicly not about the market and budget).
In that dome, you planted trees( for arguments sake, 20 of them), and now they are mature bacause you planted them 100 years ago, and they are in exelent condition. all the treees would have a 30 metre(or however much they need to support roots) soil elevation to supprt their roots.
the trees will feel like on earth and there is matenince with humans on board, watering them, and keeping them warm with earth like tempatures and so on.
you could ask now, whats the point of doing this , its only like building a greenhouse on mars - and mars' atmosphere is not getting any oxagen, because the trees are still in the dome.
well, we all know that trees take out the C (carbon) in CO2, (carbon dioxide) , to make oxagen- O2.
MARS' ATMOSPHERE IS MADE OF 95.32% CARBON DIAOXIDE
JUST 0.13% is breathable oxagen - well, not breathable hence humans need at least 21% of oxagen to breath ( 21% of the earths atmosphere is made up of oxagen, and clearly, life IS possible.
If you know how a submarine works, they have special pressurised air tanks which , when desending underwater, expell an exact % of oxagen and fill it up with water, thus "drowning" or going underwater ( due to weighing the submarine down , ovbiosly water weighs more than air does) .
If they want to go back to sea level, or rise to the surface, they pressurize the tanks (that are now filled with water) to expell the water back into the sea, and thus, the only thing that will replace the water is the air from inside the sumbarine. and when the submarine has less water, its lighter, and with more air, it begins to rise to the surface.
you may be thinking: "why is this guy talking to me about submarines? i want to know about life on mars" ,
but it is almost the exact same method of expelling air into MARS' ATMOSPHERE.
the dome holds 100%oxagen and 0%carbon dioxide.
lets you have a pressurized nozzle at one end of the dome, that sucks in (very accuratly and exact ammount, like a submarine),of carbon dioxide from mars' atmosphere. if the nozzle sucks in 10% of carbon dioxide, then the dome consists of 10% carbon, while, no oxagen left during the intake of carbon dioxide, so it would also consist of 100% oxagen.
so 100% oxagen in the dome, and 10% carbon dioxide. that makes for a grand total of 110% of gases in the dome. ( and yes it can go over 100%, think of a balloon, you can fill it to 150% of its original size) ( but this dome is not construscted of ballon plastic ovbiosly, just that its more like a car tire where its inflated but you can still put that extra 10% or air into it, to make it 110%)
with the carbon dioxide in the dome, the trees quickly begin the prosess of photosynthasis, taking away the C in CO2 and there fore producing OXAGEN!
at first, there would be, 9% of carbon didoxide in the dome, and 101% of oxagen. ( that 1% of carbon dioxide got made into oxagen)
the next day, the dome would hold 6% of carbon dioxide, 104% of oxagen. Do you see where im getting at!?
ALL THE TIME its 110% in total gases, just in different FORMS. and when theres 1% of that carbon dioxide left, there will be 109% oxagen!
after all 10% of the carbon dioxide turns into oxagen, there is 110% oxagen in the dome!
now your thinking : " he just explain photosynthasis to me, and i didnt need that either."
BUT. IF YOU TAKE 10% OF THE OXAGEN IN THE DOME, AND EXPELL IT THROUGH ANOTHER NOZZLE AT THE OPPOSISE END OF THE DOME, MARS' AT MOSPHERE HAD A TINY BIT MORE OXAGEN IN ITS ATMOSPHERE!!
it might be a small amount, actually, really relly tiny amount of oxagen that is put into mars' atmosphere, but if you have patience, (and this may go on for generations), the oxagen level is mar's atmosphere keeps rising and there is more and more and more of oxagen in it.
the dome then has 100% (not 110%) oxagen concentration, and the cycle continues, until mars' atmosphere is filled with at least 21% of oxagen ( like earth) for breathable air! BUT. we'd probably need Close to 100% ( not 21%) of oxagen in its atmosphere because keep in mind earth's amosphere in NOT 21% oxagen 79 % carbon dioxide, but rather mostly composted of helium and nitrogen, THAN oxagen (at 21%)
i know that this might seem "impossible" and i know that no one has or ever will have the bugdet to invest this, and create this dome, but im talking physicly, not on a money scale.
just think about it... we can even create not just 1 dome, but 10! or 100!! or even a city of these domes , and keep building these domes, because the more domes we have, the more quickly the carbon dioxide gets changed into oxagen, and thus expelling more oxagen into mars until it is breathable air for humans to live on.
yes i know this was long, but iv never really talked about this, jus probably because i just thought of it on my own, and i didnt know how possible is can actually seem!
please i would apreciate some feedback i'v been sitting here for the past hour typing and my ass is starting to get numb
im only 15, so if i misworded anything or theres any debate on this little theory of mine , then please reply so i can understand whatever mistake i had made.
THANKS FOR READING MUCH APREACIATED