Oh....oh..... Mr. Sarath Gunapala says that 96% of the atmosphere of Mars is carbon dioxide, you can't walk outside....you have to pitch a tent..... why are you discouraged? If there is 96% carbon dioxide in the atmosphere, Mars is more suitable for life than Earth. All that has to be done is that plants absorb carbon dioxide and release oxygen during photosynthesis. So we want to plant as many plants on Mars as possible. 96% of the carbon dioxide required for photosynthesis means that the plants grow abundantly. Due to the oxygen released by the plants, not only you can walk outdoors but you can also hold cricket matches. If someone thinks that you who had the intelligence to send rockets to Mars cannot plant a tree, then it is a raw cow...not only Elon Musk but everyone who dreams of settling people on Mars can make their dreams come true. But. You should know both the subjects of combined Maths and biology. The first step to settle people on Mars is to teach Advanced Level school students all the four subjects of Combined maths, physics, chemistry and biology. Triple gems bless you! Good luck!