GIZMOS Food Chain Gizmos
Harvard University
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Exam (elaborations) GIZMOS Food Chain Gizmos
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Exam (elaborations) GIZMOS Food Chain Gizmos 
Vocabulary: consumer, ecosystem, energy pyramid, equilibrium, food chain, population, 
predator, prey, producer 
Prior Knowledge Questions (Do these BEFORE using the Gizmo.) 
The Food Chain Gizmo™ shows a food chain with hawks, snakes, rabbits, and grass. In this 
simulation, the hawks eat snakes, the snakes eat rabbits, and the rabbits eat grass. 
1. Producers are organisms that do not need to eat other organisms to obtain energy. 
A. Which org...
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