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If the volume is big, the pressure is ______

If the volume is low, the pressure is ______

The diaphragm is flattened while breathing in, but what about breathing out?

What sort of blood vessels are found surrounding air sacs?

A process happens in the lungs where oxygen and carbon dioxide particles move about in an air sac. What is the name?

What is the scientific name for the skull?

What is the scientific name for back bone?

Name a mineral we need from our diet to help make our bones strong?