Against which of the following do the circular and longitudinal muscles of annelids work?
A) cuticle
B) shell
C) endoskeleton
D) hydrostatic skeleton

Question

Quizplus · Accepted Answer

The circular and longitudinal muscles of annelids work against the hydrostatic skeleton. This type of skeleton is formed by a fluid-filled cavity, the coelom, which provides the resistance needed for muscle contraction, allowing movement and flexibility.

Against Which of the Following Do the Circular and Longitudinal