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Most of the world’s forests are ________.

Which of the following countries has the highest population growth rate?

Malthus was responsible for ________.

Many environmental advocates believe that biofuel made from palm oil is not an appropriate replacement for fossil fuels such as petroleum because ________.

A ________ is an organism, such as a mosquito, that transmits a disease-causing organism to a host.

In all ecosystems, energy is eventually lost to the environment via ________.

Use the figure above to answer the following question(s).Which of the following does the diagram illustrate?

By studying ancient civilizations, such as the Greek and Roman empires and the Angkor civilization of Southeast Asia, historians have concluded that these civilizations declined partly because of ________.

A large flock of endemic birds is discovered on a remote island. There appears to be two similar but different kinds of birds within the flock. Which of the following information is most important in deciding whether the two kinds of birds belong to a single species?

“Edge effects” become particularly problematic when ________.