spongiae

Example:In comparison to complex animals, spongiae are considered primitive due to their simple cellular organization.

Definition:Organisms with more developed and complex body structures, such as those found in higher phyla like mollusks and arthropods.

Example:Unlike spongiae, vertebrates exhibit a high degree of biological complexity and organization.

Definition:Animals that possess a backbone or spinal column, including fish, reptiles, birds, and mammals.