This field of engineering, formerly called sanitary engineering, involves the safety of people, animals, and ecosystems. air pollution, waste management, radiation protection, and water management are some of the areas studied in this field.

How do the excerpt and diagram complement one another?

Grammar: sequence of verp tenses quiz active the is used for an event that has been completed before the present moment in time. simple past past perfect perfect progressive past perfect progressive

What do the excerpts have in common? both point out the tragic nature of situations in which children make journeys without their parents. both describe what immigrant children must do to survive when traveling to the united states. both explain why most children want to leave central america without their parents. both indicate the tragic problems and their consequences that children in central america must face.