Aaron is studying a desert ecosystem containing (1) seeds, (2) rat-eating snakes

Aaron is studying a desert ecosystem containing (1) seeds, (2) rat-eating snakes, (3) snake-eating lizards, and (4) seed-eating rats. Arrange these into a food chain ending with a tertiary consumer.
 A. 3>2>4>1.  
 
 B. 1>4>2>3.  
 
 C. 1>4>3>2.  
 
 D. 2>3>1>4.  
 
 E. 2>1>3>4.  

Brent operates a fish farm in which he feeds Chilean carnivorous fish to Atlantic salmon. How would you classify the salmon?
 A. Decomposer.  
 
 B. Tertiary consumer.  
 
 C. Producer.  
 
 D. Secondary consumer.  
 
 E. Primary consumer.

You are studying an ecosystem in which weasels prey upon mice and you estimate that the biomass of mice is much greater than the biomass of the weasels. How is this best explained?
 A. The weasels must heat their bodies.  
 
 B. The weasels are unusually small.  
 
 C. The mice are unusually large.  
 
 D. The mice are difficult to catch.  
 
 E. The weasels have a reproductive problem.