Ethnic neighborhoods most often form in order to

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

Sink holes may eventually for to join a. wide valleys b. zone of aeration c. dripstones d. aquifer