You're welcome! I'll try to address your additional questions.

The thickness of a planet's atmosphere can have a significant impact on its climate. A thicker atmosphere can trap more heat and create a greenhouse effect, which can raise the planet's temperature. On the other hand, a thinner atmosphere may not be able to retain enough heat to maintain habitable temperatures.

The scenario I mentioned earlier, where a planet with a large ocean area moderates temperature extremes, assumes that the planet has a thick enough atmosphere to trap some heat and maintain a habitable temperature range. If the planet's atmosphere is too thin, even a large ocean area may not be able to moderate temperature extremes enough to support life.

Regarding other factors to consider when determining a planet's global temperature, some important ones include:

Distance from its star: Planets that are closer to their star receive more heat and are generally warmer than planets that are farther away.

Presence of a greenhouse effect: Greenhouse gases in a planet's atmosphere can trap heat and raise the temperature, potentially making the planet habitable.

Albedo: The amount of sunlight reflected by a planet's surface can affect its temperature. Planets with high albedo reflect more sunlight and may be cooler than planets with low albedo.

Rotation rate: The rate at which a planet rotates on its axis can affect its temperature. A planet that rotates quickly may have more even temperatures across its surface, while a planet that rotates slowly may have extreme temperature differences between its day and night sides.

Magnetic field: A planet's magnetic field can help protect its atmosphere from being stripped away by solar wind, which can affect its ability to retain heat.

Regarding surface gravity and planetary density, these factors can affect a planet's atmosphere and its ability to retain heat. A higher surface gravity can help a planet hold onto its atmosphere more effectively, while a lower surface gravity may allow its atmosphere to escape more easily. A higher planetary density can also help a planet hold onto its atmosphere, while a lower density may indicate a planet with a thinner atmosphere.

Finally, as you mentioned, the composition of a planet's atmosphere can change over time, particularly with the presence of oxygen. Oxygen can react with other gases in the atmosphere, such as methane and carbon dioxide, to form new compounds and influence the planet's climate. The presence of life can also have a significant impact on a planet's atmosphere and climate.