What is an object native Americans made from shells?

The word wampum means white shell in the Algonquian language family spoken by the Narragansett people of Rhode Island and the Wampanoag people of Massachusetts. Wampum belts are made of white and purple beads, the white beads from the whelk shell, and the purple from the quahog shell.

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answer; i believe the correct answer is (a) the correlation between the cause variable and outcome variable is zero;