The Diphyllobothrium latum tapeworm can reach up to 10 meters in length and can have more than 3000 to 4000 proglottids. The definitive host and reservoir host, respectively, are:
a. fish and copepods.
b. crustaceans and humans.
c. copepods and crustaceans.
d. humans and fish.
D
The organism D. latum is a freshwater broad fish tapeworm and the largest human tapeworm. Adult tapeworms have been known to reach up to 10 meters in length, with more than 3000 to 4000 proglottids, and reside in a host for 30 years or longer. Fish serve as the reservoir host, with humans serving as the definitive host.
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