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Chemical Substances in the Nervous System That Are Similar in Structure

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Chemical substances in the nervous system that are similar in structure and in action to opiates-such as heroin and morphine-are:


Definitions:

Punctuation

The marks used in writing to separate sentences and their elements, clarifying meaning.

Business Writing

A style of writing focused on clarity, brevity, and effectiveness, used in professional and corporate communications.

Parenthetical Expressions

Phrases or clauses inserted into a sentence as additional information or explanation, usually marked off by parentheses.

Appositive

A noun or noun phrase placed next to another noun to explain or identify it.

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