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

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.

this would be about 43%