Question

carbon cycle
8 multiple answer 1 point
what are the processes that add carbon dioxide to the atmosphere?
□ photosynthesis by producers
□ fossil fuel combustion
□ decomposition
□ plant respiration
□ sunlight
□ carbon fixation by consumers
□ animal respiration
9 multiple answer 1 point
what takes carbon dioxide out of the atmosphere?
□ decomposition
□ plant respiration
□ photosynthesis by producers
□ fossil fuel combustion
□ animal respiration

Explanation:

Question 8

• photosynthesis by producers: Absorbs \( \text{CO}_2 \), no.
• fossil fuel combustion: Releases \( \text{CO}_2 \), yes.
• decomposition: Releases \( \text{CO}_2 \) (from organic matter breakdown), yes.
• plant respiration: Plants release \( \text{CO}_2 \) via respiration, yes.
• sunlight: Not a \( \text{CO}_2 \)-adding process, no.
• carbon fixation by consumers: Involves taking in carbon, not adding \( \text{CO}_2 \) to atmosphere, no.
• animal respiration: Animals release \( \text{CO}_2 \) via respiration, yes.

• decomposition: Releases \( \text{CO}_2 \), no.
• plant respiration: Releases \( \text{CO}_2 \), no.
• photosynthesis by producers: Producers (e.g., plants) use \( \text{CO}_2 \) in photosynthesis, removing it from atmosphere, yes.
• fossil fuel combustion: Releases \( \text{CO}_2 \), no.
• animal respiration: Releases \( \text{CO}_2 \), no.

Answer:

B. fossil fuel combustion
C. decomposition
D. plant respiration
G. animal respiration

Question 9