Levels of Organization
Sponges have three layers tissues, organs and organ systems
Different sponge species have different types of symmetry. Sponges can have Radial symmetry, Bilateral symmetry, and asymmetry.
Sponges don't have any cephalization.
Digestive, Circulatory, Respiratory,and Excretory Systems
Sponges do not have
Proof They're Early Life
Sponges don't have segmentation or any sort of nervous system to speak of.
Sponges can reproduce both sexually and asexually. Every cell in a sponges body contains the information to make another sponge meaning you can blend a sponge up in a blender and when everything settles more sponges will begin to form.