What is an expendable resource?

Why did the period of largely unregulated immigration come to an end in the 1920's? What are the correct actions to take when you suspect danger harm and abuse? Who are environmentalists? What makes a person normal? How much do children get paid to work in the UK? What are the consequences of not enrolling your child in school in North Carolina? Is sand a renewable source? Distrust or dislike of other people or of mankind in general? How do sow bugs sense their environment? The NAACP was largely supported by which industrialist? Who ended censorship was? Why government be Shall conserve and develop our patrimony? What is the importance of natural resources? What does a triangle pointing down mean? That people today have more choices to make today than in the past? What do the KKK wear and why? What do charities do? What conditions do children in child labor work in? What would happen if half of the plants disappeared? What are the causes of pollution in Mumbai?