It is a cavity between the body wall and the gut wall.

Organisms attached to a substratum generally possess:

How are triploblastic animals classified based on their body cavity (coelom) organization?

Identify $X$ and $Y$ in the given diagrams representing body cavities.

Statement $X$: The body of the animal is divided into identical radial parts from the central axis.
Reason $Y$: Animals possess bilateral symmetry.

Identify the correct labeling for the given figure $B$.