Against which structure do the circular and longitudinal muscles of annelids work?

The circular and longitudinal muscles of annelids work against Hydrostatic skeleton.

Explanation:

Annelids also called segmented worms are invertebrate, bilateral symmetrical, ceolomate and tripoblastic animals. They lived in marine, fresh water and moist terrestrial habitats. Examples include rag worms,leeches, and earthworms.

They have hydrostatic sketelon which is a flexible skeleton and it is fluid filled or it contains water. This skeleton has ability to affect shape, movement and its has two mechanical units which are the muscles and body walls. The muscles are circular and longitudinal. The circular muscles contraction lengthens the annelids body while contraction of the longitudinal muscles shorten the annelids body. The fluid within the organism are concentrated evenly, the muscles spread out muscles in the whole body and shape changes continue.

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the  different  of  these  two  are  that  they  differently  handle  their  team.

an  expressive  leader  focuses  on  the  task  at  hand  and  make  sures  that  their  goal  is  achieved.  they  accurately  finish  the  task.  an  instrumental  leader  on  the  other  hand  works  on  the  unity  of  the  group,  they  care  more  about  their  employees.  all  the  while  creating  a  good  environment.