____________________ is the greatest cause of extinction because of habitat loss.
Fill in the blank(s) with the appropriate word(s).
Deforestation
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Rising and falling air currents, winds, and concentrations of CO2 and other greenhouse gases in the ____ play major roles in the planet's short-term weather and long-term climate.
A. troposphere B. thermosphere C. mesosphere D. stratosphere E. tropopause
Which of the following is true regarding ozone depletion in Antarctica?
A) Increasing levels of ultraviolet radiation have not actually been measured at this time. B) The atmosphere above Antarctica has experienced a complete loss of protective ozone. C) Maximum ozone depletion occurs during the Antarctic spring, following the development of polar stratospheric clouds in winter. D) There has actually been a decrease in ultraviolet levels measured at the surface—which is contrary to what is predicted by ozone depletion models.
Ice Age glaciers had many indirect effects. Which one of the following was not such an effect?
A) sea level fluctuations B) changes in some river courses C) extinction of some organisms D) formation of mountains
Which is the most important molecule in the ecosystem?
A) oxygen B) nitrogen C) salt D) lead E) water