Sentence examples for did they exist from inspiring English sources

Did they exist before?

Are networks a strictly modern phenomenon, or did they exist in the ancient world as well?

In this he reminds me of Epicurus, who when asked if the gods listened to human prayers - in other words, did they exist, for any practical purposes - replied that he had far more important questions to answer than that.

Did they exist before the universe?

The new finding confirms that not only did they exist, but that they make up an entirely new class of dinosaurs.

This observation posed the question on how these sites evolved - did they exist in the progenitors of the mentioned repeats, or did they arise by mutations?

Do they exist?

Why do they exist?

And why do they exist?

"Do they exist or don't they exist?

In what sense do they exist?