A researcher wants to test the effectiveness of billboards in increasing HPV vaccination rates. She chooses two cities, one gets the pro-HPV vaccine billboards for 3 months and the other city does not. She collects baseline data on HPV vaccine rates at the beginning of the study and then again at 3 month and compares HPV vaccine rates between the two cities. This is what type of study

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step-by-step explanation:

c

-by-step explanation:

it would be c

a mantle plume is an upwelling of abnormally hot rock within the earth's mantle. as the heads of mantle plumes can partly melt when they reach shallow depths, they are thought to be the cause of volcanic centers known as hotspots and probably also to have caused flood basalts.

step-by-step explanation:

0.5?

hope your goes well, here's a turkey

-thekoolkid1o1