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

in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.