Question

the birds/fly/to their nests once it is dark​

Answer 1

Explanation:

the birds fly to their nests once it is dark

Answer 2

Answer:

Once it is dark the birds fly to their nests.(if a {/}sign would be also between nests and once)

But the right answer according to your question is

The birds fly to their nests once it is dark.

Explanation:

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