The correct answer is b) both carbon dioxide and nitrogen.
Green plants continuously take in carbon dioxide during the day for photosynthesis, during which they convert it into glucose and release oxygen as a byproduct. Nitrogen is also important for plants, but it is primarily absorbed from the soil and used for growth and development, so it is not a gas that is constantly required in the same way as carbon dioxide.
During the night, plants primarily use oxygen for respiration but do not uptake carbon dioxide during this period. Therefore, "both carbon dioxide and nitrogen" is a more accurate representation of what is continuously required by plants in nature over a 24-hour period.
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