Considering the Age of the Various Segments of an Annelid

question 39

Multiple Choice

Considering the age of the various segments of an annelid such as an earthworm,

• A)they are born with all segments present and these merely grow in size;this allows segment count to be a major feature in their identification.
• B)new segments are added just behind the prostomium,so the oldest segments are at the posterior end.
• C)new segments are added just in front of the pygidium,so the oldest segments are at the anterior end.
• D)each segment doubles several times in life so all of the segments are half or one-fourth "new" at any one time.
• E)segments grow and duplicate in a haphazard fashion preventing their use in identification.

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