What gas is produced by plants during photosynthesis, as observed in Kesha's aquarium?

During photosynthesis, plants utilize sunlight to convert carbon dioxide and water into glucose and oxygen. This process is fundamental for the survival of most life forms on Earth, as it produces oxygen, which is essential for respiration in animals and humans. In Kesha's aquarium, as plants undergo photosynthesis, they release oxygen bubbles into the water, which can often be observed, especially in well-lit environments. The production of oxygen is a direct result of the chemical reactions that take place in the chloroplasts of plant cells, where light energy is harnessed to convert raw materials into energy-rich compounds while releasing oxygen as a byproduct. This is why oxygen is the correct answer, as it specifically highlights the gas released during the photosynthesis process of plants.