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D.
Glucose is energy, which means it breaks down when energy is consumed. When a fox consumes it's pray, a seagull glides trough the air and a duck rests on a pond, not much glucose is consumed.
Energy is used when physical effort is necessary, and running from a predator, requires a lot of energy.
Hope it helped,
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Answer:
A. Specialized cells are made up of tissues 
Explanation:
Cells make up tissues, tissues make up organs, organs make up organ systems and organ systems make up an organism. 
All the other options are correct, but cells are not made up of tissues. 
Hope this helps!