So far, we can only speak for our own planet, Earth; we're not aware of any other planet with either plant life or large quantities of free oxygen.
On Earth, oxygen is produced by plants, which take in carbon dioxide and secrete oxygen, much as animals breathe in oxygen and breathe out carbon dioxide. We really are in symbiosis with our planet.
The Earth is the only planet with a large quantity of free oxygen, which came about because of plant life, which uses carbon dioxide and energy from the Sun to manufacture carbon for plant tissues, giving out oxygen as a waste product. About 21% of the Earth's atmosphere is oxygen.
To sustain life, a planet must have oxygen and a variety of gases, plant life, strong enough gravity and enough clean water.
If a star system has planets, the availability of oxygen on a given planet is a complicated process. If the planet is of the correct size and in the ecosphere of the star, the production of oxygen will occur through the existence of plant life that will convert carbon dioxide into oxygen. In a primordial planet like an earth, oxygen is not going to be an element that is naturally occurring. The compound carbon dioxide is. It takes plant life to produce an atmoshpere that will sustain animal life.The odds of this happening in a given star system are low, but possible.
Earth is the only planet with abundant oxygen in its atmosphere because it has a unique combination of factors that allow for the presence of oxygen-producing life forms, such as plants. Other planets may lack oxygen due to their distance from the sun, composition of their atmosphere, or absence of life forms that can produce oxygen through photosynthesis.
You cannot produce plant life without other plant life. That can include a seed or a cutting from another plant.
That either A. That plant has oxygen, sunlight, water like our planet or B. That plant has found other means of supporting life beyond what we already know.
Our planet, the Earth is the only planet with drinkable water. It is the only planet in our Solar System with life and oxygen. Without the oxygen, there will be no life and water on Earth.
Forests recycle the carbon dioxide in the air and turn it into oxygen. Almost all animals aon the planet need oxygen to survive.
plants produce oxygen by using carbon dioxide for photosynthesis, which is how plants get energy. Both are essential in the form of water to sustain life in plants. Oxygen also helps in aerobic form of respiration.
If there was no plant life on earth, there would be no human life, or animal life of any kind. Without plants, there would be no autotrophs (organisms that produce their own food) so other organisms, which need to consume food, there would be no food for other organisms. Also, since plants produce oxygen for heterotrophs (organisms that consume food to produce energy), there would be no oxygen for us to breathe and we would suffocate.
They discover the world and if a plant survives there, oxygen juhddsbfjdsbvfafjdsfjdfgjtgufrjgftry giufrewfirefbrefggfhfnf fb fbfbiefhf bbfr ffervbfe tbhreug
Earth supports life, because it has oxygen.