C. either a proton or a neutron
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Sneezing causes the release of endorphins, which are hormones that trigger the brain's pleasure center, thus giving us a brief “feel good” effect
No. Osmosis is the movement of a solvent through a membrane (semi-permeable) from a less concentrated solution to a more concentrated solution to the point where the two sides reach equilibrium. Isotonic solutions are solutions where the two sides of the membrane are already at equilibrium - so there is no movement of the solvent (like water) - so this is different from osmosis.
It is the abdominal cavity that contains the digestive organs.
