Question detail
How did marine organisms contribute to the decrease of carbon dioxide in the atmosphere?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
The composition and evolution of the Earth's atmosphere
Question
- A. By producing oxygen
- B. By using carbonates to form shells
- C. By releasing methane
- D. By absorbing nitrogen
Answer
The correct option is By using carbonates to form shells. This answer is correct because it matches the approved learning objective to explain why the amount of carbon dioxide in the atmosphere decreased over geological time in the subtopic How carbon dioxide decreased.
Explanation
The correct option is By using carbonates to form shells. By using carbonates to form shells is correct because it directly supports the approved learning objective to explain why the amount of carbon dioxide in the atmosphere decreased over geological time. This belongs to the subtopic How carbon dioxide decreased within The composition and evolution of the Earth's atmosphere, so the explanation must stay tied to that curriculum context. The other options are incorrect because they either do not answer this learning objective, use a vague statement, or move away from How carbon dioxide decreased.
Common mistake
Misunderstanding Carbon Dioxide Removal
Students often state that carbon dioxide decreased solely because it was used by plants for photosynthesis, without mentioning other processes like ocean absorption and carbonate formation.
Do not treat this as a general statement about carbon dioxide. Instead, answer by clearly linking the correction to explain why the amount of carbon dioxide in the atmosphere decreased over geological time in How carbon dioxide decreased. This keeps the response inside The composition and evolution of the Earth's atmosphere and prevents a vague or off-topic GCSE answer. The mistake to avoid is: students often state that carbon dioxide decreased solely because it was used by plants for photosynthesis, without mentioning other processes like ocean absorption and carbonate formation.
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