[Vocabulary] zero article + plural=definite article the + singular for generalization

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Yonsu99

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The zero article is used to refer generically to all members of a class.
27a. Dogs are domestic animals.
Articles in English

the
a — used before a singular noun to refer in a general way to people or things of a particular kindThis book gives some useful tips for the beginner. [=for beginners]
The cobra is a poisonous snake. [=cobras are poisonous snakes]
Learner's definition of THE

It seems I can use either 'the singular noun' or 'plural noun with no article' to generalize a particular group or kind. Am I understanding correctly? Or is there any cognitive difference, for example between "The cobra is a poisonous snake." and "Cobras are poisonous snakes."?
 

emsr2d2

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As far as I'm concerned, you're correct.

Dogs are domestic animals.
The dog is a domestic animal.

Both sentences are correct and use "dogs" and "the dog" to refer to the collective species.
 

MikeNewYork

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When we use an adjective as a noun representing the group in general, we use the definite article.

The poor should be supported.
The rich have few worries.
 

Charlie Bernstein

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You are exactly right. "The cobra is a poisonous snake" and "Cobras are poisonous snakes" mean the same thing.
 
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