Highlight details that explain why it is important to use current information. Whenever you read nonfiction, it's a good idea to check and see what the author has to say about how he or she found out about the topic. It helps you figure out how reliable the information is. (However, even reliable work gets outdated -- especially in science, where new information and discoveries can take surprising turns.)

—A Black Hole Is NOT a Hole,
Carolyn Cinami DeCristofano

Why would it be a problem if someone used old scientific research as a source?

A. New discoveries might have replaced old research.
B. The author might not have used reliable sources.
C. Reliable research seldom changes.
D. Old scientific research cannot still be valid.

the hollywood film industry of 1950 was threatened on several different fronts. television broadcasting was rapidly becoming the dominant entertainment medium in the united states. the paramount anti-trust consent decree requiring separate ownership for production companies and theater chains had gone into effect on 1 january 1950. large numbers of young men and women were marrying, having children, and moving to the suburbs, which affected the viability of downtown first-run movie theaters. foreign revenues were endangered by protectionist tactics including quota systems, high taxes, and blocked funds. finally, the morality and patriotism of hollywood films and filmmakers were under attack from government, religious, and citizens' groups.

explanation:

the answer is a

explanation: