A Scientist filled a glass container with water and places an aquatic plant inside the container then closes the lid and places the container in direct sunlight. The scientist observe small bubbles on the surface of the plant on day 1 and 2 but on day three the bubbles were gone. which substance should be aded to the water in order to make the bubbles come reappear.

The bubbles observed on the surface of the plant are likely oxygen produced by the process of photosynthesis. In order to make the bubbles reappear, the scientist should add carbon dioxide to the water, as it is one of the key reactants in the process of photosynthesis. By adding carbon dioxide, the plant will be able to continue producing oxygen through photosynthesis, resulting in the reemergence of bubbles on the surface of the plant.