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The amount of CO2 released by human activities per year is approximately ___________.

A more sustainable form of managing grasslands is

The most abundant element in the Earth’s crust is _________.

________ is/are examples of secondary pollutants.

The best definition of a hypothesis is a(n)

A chemical that causes abnormalities in a growing fetus is called a(n)

In general, water use in poor countries is dominated by

Lauren, a U.S. citizen, enjoys many benefits stemming from administrative agency regulations. Lauren also owns her own business. As a business owner, Lauren is concerned about the high costs complying with these regulations imposes on her business. As a result, Lauren

Humid tropical forests have extraordinary biological diversity

Detection of toxic chemicals depends upon