Question

locomotion in coelentrates , annelida , echinodermata with reference to hydrostatic movement.

Answer 1

Answer:

hydrostatic movement is seen in annelida

Answer 2

Answer:

Hydrostatic movement occurs in invertebrates where 'muscles contract' to change the shape of an organism’s coelom which help in the production of the pressure of the certain fluid which is filled up in the fluid-filled cavity. This pattern is followed by the 'coelenterates', 'annelids', and 'Echinodermata'.

Explanation:

The creatures having a skeletal structure of hydro-skeleton has the 'ability' to change its movement and shape. This is most common among 'primitive invertebrate animals.'