Four students are investigating a pond ecosystem on a clear sunny day. They notice that the underwater plants are releasing bubbles. What accounts for this observation?
- AThe bubbles are carbon dioxide produced during photosynthesis. The plants are getting their energy from the Sun.
- BThe bubbles are carbon dioxide. The plants are getting their energy for photosynthesis from respiration.
- CThe bubbles are oxygen produced during photosynthesis. The plants are getting their energy from the Sun.
- DThe bubbles are oxygen. The plants are getting their energy for photosynthesis from the minerals absorbed through their roots.