What dissipated poisonous ammonia and methane gases in the Earth's atmosphere?

The sun plays a crucial role in the Earth's atmospheric processes, including the dissipation of harmful gases such as ammonia and methane. Through its energy, the sun drives various chemical reactions and promotes the breakdown of these gases in the atmosphere.

For instance, sunlight can provide the necessary energy for photolysis, a process where sunlight breaks down complex molecules into simpler ones. This is particularly relevant for gases like methane, which can undergo photochemical reactions that ultimately lead to its conversion into less harmful substances. Similarly, ammonia can be neutralized through reactions with other atmospheric components facilitated by solar energy.

In contrast to the other choices, which have different physical or climatic functions, the sun's role in driving photochemical processes directly impacts the degradation and dissipation of these toxic gases. This distinction highlights the unique function of solar energy in maintaining the chemical balance of the atmosphere.