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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.

If gross primary productivity (GPP) in a wetland is 3 kg C/m2/year and respiration (r) is 1.5 kg C/m2/year, what is the net primary productivity (NPP) of this wetland?

ENSO (El Niño Southern Oscillation) weather patterns are characterized by variations in air pressure and temperature. Which type of ENSO pattern contains both low air surface pressure and a cooling phase? 

Which best explains the impact of the sun on wind circulation patterns?  

Which of the following chemical reactions is the correct one that leads to the formation of acid rain from sulfur oxides?