Oxygen
to live
it is possible to live on Mars but to do this you would need an atmosphere, and to have an atmosphere you need gases. To make these gases (there have been discussions about this) you would need to build factories to give off green house gases and make an atmosphere, because Mars is extremely cold at night, then we would have to get people to Mars. This would cost billions and would take a long time to build the atmosphere.
they need to have fo water and gases like carbon dixodide to live athor wise they will die and another cell will come
The earth requires a certain amount of greehouse gases.
You live in the troposphere. It contains all the gases important for life.
They all need food, water, shelter and an exchange of gases. The above is a good start for terrestrial animals, but the ones in the sea do not need shelter or water because they live in water which is also their shelter. Plus, if we include plants, they are also living, but they also do not need shelter, and their exchange of gases is opposite that of animals.
h2o
because you need different riss of gases in each cube of ice
Well one gas - Oxygen, is needed for you to live.
i need an answer
Your a nerd
Oxygen and carbon dioxide.