Hello, i am to this application i hope you take your time to me answer something so easy

¡this is science but i don't find the subject that goes in the application!

Which of the following areas have the highest population density? a) quebecb) united statesc) californiad) new york city

Does the threat of global warming require international cooperation? why or why not?

What did the native title act do? a. it recognized and protected aboriginal rights to land. b. it stated that aborigines were to be counted as part of the census. c. it established aboriginal languages as official. d. it granted aborigines suffrage.