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A plover bird eats bits of food that become stuck in a crocodile's teeth without being hurt. The crocodile gets its teeth cleaned and the bird gets food. Which type of relationship exists between the bird and the crocodile?

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The questions have been asked in several important state and regional science exams in the United States. For example: TAKS-Texas Assessment of Knowledge and Skills, New York State Educational Department Regents exams, California Standards Test, etc.


1. A plover bird eats bits of food that become stuck in a crocodile's teeth without being hurt. The crocodile gets its teeth cleaned and the bird gets food. Which type of relationship exists between the bird and the crocodile?





 
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