The amount of gravitational pull helps determine the gases that can form an atmosphere around a large body in space. So the mass of an object also determines the density of these gases. Note that several factors come into effect for a large object to sustain their gases if present.
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the heart it is because the heart beats and it goes up and down
Probably very distantly, but sharks are fish, and dolphins are mammals.
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A lysosomes is where glucose is stored
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d ferret is an exotic animal
