Cell specialization:
The characteristic of having separate roles for each type of cell in a multicellular organism; the cells are specifically designed for a certain function; it has a certain purpose or job.

Animal kingdom

TEMPLATE

Embryonic germ layer:
The mesoderm germ layer forms in the embryos of triploblastic animals. During gastrulation, some of the cells migrating inward contribute to the mesoderm, an additional layer between the endoderm and the ectoderm .

Body symmetry:
a basic body plan in which the left and right sides of the organism can be divided into approximate mirror images of each other along the midline.

body cavity:
Any space in the body that does not freely communicate with the outside. Body cavities are covered with specialised lining cells