This is for my little brother my mom and everyone basically has tried to do this please help it is literally so confusing

Which of the following areas has the highest population density?

In the following diagram, four different index fossils are labeled: which of the labeled fossils comes from the oldest organism? a b c d

Dubai is challenged by all of the following environmental factors except a. a warm and dry climate b. a lack of annual rainfall c. scarce freshwater resources d. a lack of valuable natural resources