Describe three impacts industrialization and the development of agriculture have had on the Earth's ecosystems
Answers should address three of the following?
• Since 1750, the total forested area on the Earth has declined by more than twenty percent.
• Today, there are more trees on farms than in wild forests.
• Since 1750, total cropland has grown by nearly 500 percent.
• Since 1750, people have released the quantities of fossil carbon that the planet took hundreds of millions of years to store away.
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A. a circle B. an irregular polygon C. a rectangle D. all of these are correct E. both a circle and a rectangle
____________ species are sometimes transported to new habitats in ballast water. Fill in the blank(s) with the appropriate word(s)
The ionosphere:
A) is characterized by the neutral state of its constituent atoms. B) begins in the lower stratosphere. C) ends in the thermosphere. D) has a relatively constant temperature.
Which of the following is causing widespread concern?
A) As atmospheric oxygen levels decline, the ozone layer is being destroyed. B) As atmospheric carbon dioxide levels decline, the ozone layer is being destroyed. C) As levels of methane decline, average global temperatures are increasing. D) As levels of carbon dioxide increase, average global temperatures are increasing.