What levels of organization are missing in sponges?

Related questions

• What levels of organization include abiotic factors?
• What is cellular specialization?
• What characteristic determines whether organisms belong to the same species?
• Which classifications are used in the scientific name of an organism?
• How is the classification of living things organized?
• What is the taxonomic classification for sunflowers?
• Whats the difference between taxonomy, binomial nomenclature, and phylogeny?
• The classification system developed in the early 1700s divided living organisms into plant and...
• The classification system developed in the early 1700s divided living organisms into plant and...
• Two different species belong to the same class. What other levels of classification do they have...