What atmospheric gas played the most significant role in shaping the modern look of the earth? Why?

Air is a mixture of gases. The most important of these is carbon dioxide and oxygen. In addition, the air is filled with water vapor evaporated by the oceans. Animals and humans use oxygen – their existence is impossible without it. But carbon dioxide is a special topic. Only plants can “inhale” it, and they exhale oxygen.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.