While dissecting, you are usually advised that scissors are better than __(1). The tips of the scissors should be pointed __(2) and ___(3) from yourself.

heat a spark and oxygen

in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

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explanation:

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