Final answer:
Every 10 years, a census is conducted in the United States to count the number of people living in the country. Based on the results of the census, Congress determines how many representatives each state will have.
Step-by-step explanation:
The missing words are A) Representatives, resources. Every 10 years, a census is conducted in the United States to count the number of people living in the country. Based on the results of the census, Congress determines how many representatives each state will have. These representatives play a role in making decisions and allocating federal resources to each state.