Prepositional phrases can be which means that they modify a noun or pronoun

Which of the following statements about the migration of workers to other countries is false?

Which environment would most likely not contain fossils? a a thick deposit of cracked, dried mud b sediment deposited in a sandy river bed c intrusive rock formed from cooled magma d layers of sand accumulated for a century

If a population is growing quickly in a small area then what must increase as well