Earth is a living planet because it is habitable by living organisms. It has a perfect condition for life hence organisms exists not only on the land, but also in the water and the atmosphere. Mars on the other hand does not have the correct atmosphere, and a temperature not conducive for life.
Step-by-step explanation:
Mars and Earth are very unconventional planets when it comes to temperature, size, and atmosphere, but geologic methods on the two planets are surprisingly related. On Mars, we see volcanoes, canyons, and contact basins much alike the people see on Earth. There is a temperature difference that is the chief cause for life to not exist on Mars and no evidence recorded yet to have life on Mars