Answer:
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That time that Barbara and Jimmy went to a museum, they also went to the icecream shop.
Answer:
Some seemingly trivial details often contribute to the forshadowing of later developments in the plot.
Some detail that seems trivial to one reader may help another to relate to the experience or to better imagine the scene or character.
Trivial details sometimes serve as context clues to help develop better comprehension of a complex concept.
Explanation:
Maybe it's just comic relief!
The writer's attitude is of fascination. He/she is amazed by how the insects and spiders' behaviour towards their progeny combines reasoned actions and instictic ones.