Question

which one?
bristles on the outside of some annelids
coelom setae septa

Explanation:

To solve this, we analyze each term:

• Coelom: A body cavity in animals, not related to bristles.
• Setae: Bristle - like structures found on the outside of some annelids, used for movement and other functions.
• Septa: Internal partitions in some organisms, not external bristles.

So the correct term for bristles on the outside of some annelids is setae.

Answer:

B. setae