With regard to the two types of annelids, oligochaetes have ______ setae, and polychaetes have ______ setae.
Question
With regard to the two types of annelids, oligochaetes have ______ setae, and polychaetes have ______ setae.
Solution
Oligochaetes have few setae, while polychaetes have many setae.
In terms of diversity, oligochaetes, such as earthworms, typically possess a limited number of bristle-like structures called setae, which aid in locomotion and soil burrowing. In contrast, polychaetes, often found in marine environments, exhibit a greater number of setae that are often more pronounced and can play multiple roles, including sensory functions and aiding in swimming or burrowing. This distinction in the number of setae reflects the adaptations these two groups of annelids have developed in their respective habitats.
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