If we could develop a way to put some kind of photo-synthesizing life-form on Mars (plants or microbes), would the atmosphere eventually be able to support life due to the gases used and expelled by these life-forms?

What is the chemical makeup of the Martian soil, and how does it differ over various landscapes? What may need to be added or altered to make it suitable for bacterial and plant life?

Would earth plants and fauna survive in the high carbon dioxide atmosphere on Mars?

is their any plants capable of surviving on mars? Such as cactus's or other plants we have in the desert?

Will it be possible to grow plants on Mars using local resources ? Are light levels sufficient?

Technically, could we take plants to mars in the Martian summers in the tropics, and let them use some carbon dioxide? Then if we did that for say, 10,000 years, there might be a sufficient enough oxygen to have terraformed Mars?

Has an experiment been conducted yet about how plants react to reduced gravity?

Can you grow plants on mars, for example a pine tree?

Whould any type of plant be able to survice in martian surface?

If we were to grow plants on Mars, which ones would be the most active?