The ocean absorbs from the atmosphere, which organisms can turn into that can be used to make calcium shells.
First blank is it:
A. sulfur
B. nitrogen
C. carbon dioxide
Second blank is it:
A. sulfates
B. nitrides
C. bicarbonates
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Ответ:
Ответ:
System
Explanation:
In descriptive scientific investigations, scientists often make observations to understand the interacting parts of a complex System Scientists are studying