21. Non-biodegradable pollutants are created by  
						
					22. Respiratory roots are known as
						
					23. The conversion of a pond to a climax forest community is an example of
						
					24. Which of the following is a nonrenewable energy resource?
						
					25. What type of energy is derived from heated groundwater?
						
					26. All of the following are advantages of dams except  
						
					27. The combustion of waste in the absence of Oxygen is called
						
					28. Atmospheric humidity is measured by
						
					29. Freshwater protozoans react to a/an  __________ environment by removing water through _______
						
					30. Which of the following is the poorest conductor of heat?
						
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