A hydrogen bond is the electromagnetic attraction between polar molecules in which hydrogen is bound to a larger atom, such as oxygen or nitrogen. This is not a sharing of electrons, as in a covalent bond. Instead, this is an attraction between the positive and negative poles of charged atoms.
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A heart beat, breathing, and moving ;)
Answer:
voluntary, you did it by will
Explanation:
Cold air usually pushes warm air because cold air has a HIGHER DENSITY
