What is the primary reproductive role of the noticeable, swollen structure called the clitellum on an earthworm?
Answer
Secreting the mucous cocoon that holds the eggs
The clitellum is a prominent anatomical feature visible on many earthworms, appearing as a swollen, light-colored band situated towards the anterior end of the body. Although it is not involved in the immediate process of ingesting food or respiration, the clitellum performs a critical function in sexual reproduction. This structure is responsible for secreting the necessary mucous cocoon. This secreted material envelops the eggs, providing a protective casing where fertilization and early embryonic development take place before the young worms emerge.
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