The two ideas that should be included in the introduction of a story about ducklings trying to find their mother on a big lake are:
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The location of where the ducklings are on the lake.
This establishes the setting for the story and gives context to their journey. -
The problem the ducklings face when hiding from boats on the water.
This introduces the conflict or challenge that the ducklings must navigate, engaging the reader's interest right from the beginning.