the stimulus controlling the operant response is called a stimulus. for example, students do not learn simply when material is set in front of them. instead, the material sets the occasion for learning to occur.

your answer is "the 1950's"

your answer is true

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explanation:

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.