The Earth atmosphere is livable because it contains oxygen, keeps the temperatures in levels that make possible to the living beings survive, protects from harmful ultraviolet solar radiation, and creates pressure that make possible that liquid water exist in the surface of the planet. Therefore, the options that are true to the functions of the atmosphere to make possible the living being survive in the Earth are:
- contains oxygen;
- provides warmth;
- blocks harmful energy from the Sun.
The others are not apply because of the fact that, the seasons are related to the Earth moviment and not only by atmosphere conditions, and there is others factor related to the creation of important nutrients (that can occurs in atmosphere) but are not created by the atmosphere.