Answer: Hydrogen bonds.
Explanation: This seems like more of a chemistry question, but basically hydrogen bonding is way stronger than any other kinds of bonding, and because water molecules are all hydrogen bonded, they cling together a bunch and are thus super cohesive.
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Most likely to involve the amygdala.
Sometimes you mix different substances and you don't make new substances but mostly of the time you do make new substances , so the answer is chemical change.