A Fluid-Filled Body Cavity That Forms Completely Within the Mesoderm

Question

A fluid-filled body cavity that forms completely within the mesoderm of animals is a
A) deuterostome.
B) blastula.
C) gastrula.
D) protostome.
E) coelom.

Accepted Answer

A fluid-filled body cavity that forms completely within the mesoderm is called a coelom. The other options (A, B, C, and D) are developmental stages or branching points in animal evolution and are not directly related to body cavity formation.