Based on the passage, brachiopods are an index fossil because they are

A. older than most fossils

Explanation:

the completion of the erie canal spurred the first great westward movement of american settlers, gave access to the rich land and resources west of the appalachians and made new york the preeminent commercial city in the united states.

the court ruled that a state law that banned abortions (except to save the life of the mother) was unconstitutional

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