Data about the size and composition of a population are gathered in a survey called a. vital statistics b. a census c. doubling time d. a demographic

(B) A census

Explanation:

 The census is conducted every 10 years and it is the collection of the data about the composition and the size of the population and then prepare a survey report after gathering all the information about the population.

 This is known as census and it is important as by using the census information we determine which school, hospitals and the communities need the Federal funds.

Therefore, Option (B) is correct.

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