A waste product of respiration in animals that is

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8. A waste product of respiration in animals that is usedby plants to carry out photosynthesis is a. carbon dioxide. b. carbon monoxide. c. calcium carbonate. d. sodium bicarbonate. 9. Ozone molecules are destroyed by 10. Greenhouse gases are added to the atmosphere through 11. On Earth, water exists as 12. The only atmospheric layer containing measurable amounts of water is the a. stratosphere. b. troposphere. c. mesosphere. d. thermosphere. 13. Plants contribute large volumes of atmospheric water vapor to the air through the process of 14. The clouds that occur at the highest altitude are usually
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15. Sheet-shaped clouds are called 16. Condensation and the formation of cumulus clouds begins as the rising air reaches its a. dew point. b. maximum altitude. c. minimum altitude. d. evaporation point. 17. Air becomes wind as it flows from 18. The region where warm and cold air masses meet is called a 19. The climate of a region or location is affected by 20. Historically, global climate a. has always been the same. b. has varied slightly over time. c. has varied greatly over time. d. None of the above
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