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Fire plays a crucial role in the germination of certain plant species found predominantly in which of the following biomes?    

The practice of replanting trees in an area where forests have been removed is known as:    

Cover crops are rotated with cash crops primarily to:  

Why can reduced light penetration caused by sediment pollution be harmful to primary producers in aquatic ecosystems?    

The American Alligator plays a crucial role in maintaining the balance of its wetland ecosystem by creating gator holes that provide habitat for other species. This makes the American Alligator a good example of a:    

 Which of the following best describes a drawback of using genetically engineered crops?

Farmers use various methods of irrigation on crops. Which of the following statements correctly pairs an irrigation method with an advantage or disadvantage?

Identify what the dotted line represents in the figure below.  

The intrinsic growth rate of a population 

Human construction of buildings, pavement and reservoirs affects the hydrologic cycle by I.  increasing runoff. II.  increasing evaporation. III.  increasing percolation.