25796
These worms use vertebrates ( marine mammals , fish - eating birds and waterfowl ) as definitive hosts and invertebrates ( amphipods , decapods and euphausiids ) as intermediate hosts to complete their life cycle .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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