Hello Pedram: I would add the following, concerning the sentence:
"No animal species can survive indefinitely on Earth."
Although this is declarative sentences, the meaning is not entirely clear due to a lack of specificity. No context is offered for example. Species survival has never been published nor presumed to be "indefinite"; and as a consequence, it cannot be known what the intended meaning is.
For example, is the author of the sentence addressing some published assumption that there exists species which are presumed to exist "indefinitely"?
To my knowledge, there has never been a published conclusions which presumes that any animal species has survived or will survive "indefinitely".
Is it the intended meaning of the author that all species are suffer extinction?
That would require clarification. The term "indefinitely" is being used in a generalized context, which deprives the sentence of specific meaning. What specific issue does this statement address? No one knows, for which reason, nobody can determine what this declarative intends to show or inform about.
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