Animals
The organ level of organisation in animals can be first detected in flatworms and the more advanced phyla. The less-advanced taxons (like Placozoa, Porifera and Radiata) do not show consolidation of their tissues into organs.
Read more about this topic: Organ (anatomy)
Famous quotes containing the word animals:
“Humans are amphibians—half spirit and half animal.... As spirits they belong to the eternal world, but as animals they inhabit time.”
—C.S. (Clive Staples)
“Chinese civilisation is so systematic that wild animals have been abolished on principle.”
—Aleister Crowley (1875–1947)