Why did the atmosphere keep changing even after oceans formed?

Correct answer: Dissolution of gases in water and later biological activities continued

Direct answer: Option A. The atmosphere continued to change because gases could dissolve in ocean water and, later, living organisms altered the composition of the air through biological activities. The atmosphere is not a fixed layer; it interacts with oceans, rocks, sunlight and life. First, when the Earth cooled, water vapour condensed and oceans formed. Some atmospheric gases dissolved in that water. Later, organisms used carbon dioxide and released oxygen through photosynthesis, while respiration and decay returned other gases. Option A includes both important processes. Option B is wrong because gravity did not end; gravity continued to hold the atmosphere and oceans near Earth. Option C is wrong because the core did not come to the surface. Option D is wrong because solar wind did not create all atmospheric gases; it can influence atmospheric loss, but it is not the complete explanation. Memory cue: atmosphere changes through rock, water and life.