Final answer:
The Iroquois culture values corn, beans, and squash, and their ceremonial practices include singing and using tobacco. They also use creation myths to explain their cultural practices.
Step-by-step explanation:
A reader can infer several things about Iroquois culture from this passage. Firstly, corn, beans, and squash are important to Iroquois culture as they are mentioned as the three sister plants that grew from the mother's grave. Secondly, Iroquois ceremonial practices include singing and using tobacco, as it is mentioned that people dance and sing to her to make the plants grow, and tobacco is used to give thanks in ceremonies. Finally, it can be inferred that the Iroquois use creation myths to help explain their cultural practices, as the passage describes the belief that the plants grew from the mother's grave.
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