What does the Lorax say may stop the once-ler from making more thneeds

What refers to the distance between two sound frequencies or pitches?

Why did the pilgrimage churches undergo large scale building projects? a. to accommodate the rising number of visitors b. to provide a clearer path for communion c. to appear more like a cross d. none of the above

This is a type of government in which a group of individual states are united under astrong, central government.