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4. What are setae?

A. Setae are the flagella found on the choanocytes of sponges.
B. Setae are tentacles that contain stinging cells in Cnidarians.
C. Setae are specialized digestive glands that secrete enzymes.
D. Setae are bristles found on the segments of Annelids.

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Final answer:

Setae are bristles found on the segments of Annelids that assist in movement, burrowing, or defense.


Explanation:

Setae are bristles found on the segments of Annelids. In polychaetes, the setae are anchored in the epidermis and are borne on paired appendages called parapodia. These chitinous bristles, when protruded, aid in movement, burrowing, or defense for the Annelids.


Learn more about Annelids here:

https://brainly.com/question/36926368


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