Question

question 2
what gas do plants take in during photosynthesis?
oxygen
carbon dioxide
nitrogen
helium

Explanation:

Photosynthesis is a process where plants use light energy to convert carbon dioxide and water into glucose and oxygen. The reactants taken in by plants for this process are carbon dioxide (from the air) and water (from the soil). Oxygen is a product of photosynthesis (released by plants), nitrogen is mainly used by plants in the form of nitrates (after nitrogen - fixing processes in the soil), and helium is not involved in the photosynthesis process.

Answer:

Carbon dioxide