Question

multiple choice question
there is a natural annual increase and decrease in carbon dioxide levels in the northern hemisphere because
o plants absorb carbon dioxide in the spring and summer as they grow and release it in fall and winter as plant material decays
o the production of carbon dioxide in the spring and summer increases as the ultraviolet radiation that produces it is stronger
o the comets and meteor showers that provide carbon dioxide to earth increase in the fall and winter months

Explanation:

Plants play a major role in the carbon - dioxide cycle. During spring and summer, they photosynthesize and absorb carbon dioxide for growth. In fall and winter, as plant material decays, carbon dioxide is released back into the atmosphere. Ultraviolet radiation does not directly produce carbon dioxide in significant amounts in the atmosphere, and comets and meteor showers are not a major source of Earth's carbon dioxide.

Answer:

plants absorb carbon dioxide in the spring and summer as they grow and release it in fall and winter as plant material decays