Answer:
i need answer for this question?
Explanation:
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Nitrogen, oxygen and argon are the three most abundant elements in the atmosphere, but there are other key components that are required for supporting life as we know it on earth. One of those is carbon dioxide gas.
I think the correct answer from the choices listed above is option B. Models need to be changed when <span>scientific understanding changes. This should be done since the assumptions where the models are based on are changed. Hope this answers the question.</span>