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Theory:

Porifera:
The name Porifera means organisms with pores. This species includes animals that are non-motile and attached to reliable support. They are commonly called as sponges and are mostly marine. These organisms contain pores all over their body which lead to a canal system. This canal is involved with circulating water throughout the body so that the food and oxygen are transported to the various parts. They are externally covered by a rigid skeleton made of spongin protein and calcium carbonate.
The body of these organisms has a minimal differentiation as follows:
  • They show cellular-level of organisation
  • They lack tissues and organs.
  • Their body does not show any segmentation.
  • They are acoelomates.
FotoJet2.png
Clockwise from top left: Leucosolenia (smallest sponge), Euplectella (Venus flower basket), Spongilla (freshwater sponge) and Sycon
Coelentrata:
They are also known as cnidarians. These are aquatic animals that show more body design differentiation. They are often found as colonies, but like a hydra, some are solitary.
The body of cnidarians:
  • Their body is made up of two layers of cells: An inner lining of the body and outside the body. Hence they are known as diploblastic animals
  • They show the tissue level of organisation
  • Their body lacks segmentation
  • They lack organs
  • They are acoelomates          
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Clockwise from top left: Aurelia (Jellyfish), Sea anemone, Adamsia, Corals and Hydra
Reference:
https://upload.wikimedia.org/wikipedia/commons/8/82/Sycon_sp.png
https://upload.wikimedia.org/wikipedia/commons/thumb/6/6b/Sponges_at_SAS_Transvaal_DSC09129.JPG/512px-Sponges_at_SAS_Transvaal_DSC09129.JPG
https://www.flickr.com/photos/noaaphotolib/9734258717
https://upload.wikimedia.org/wikipedia/commons/0/0b/Spongillidae_middle.jpg
https://upload.wikimedia.org/wikipedia/commons/thumb/7/71/Pagurus_prideaux.jpg/512px-Pagurus_prideaux.jpg
https://www.flickr.com/photos/usfwspacific/5565696408
https://upload.wikimedia.org/wikipedia/commons/thumb/0/0a/Mikrofoto.de-Hydra_15.jpg/512px-Mikrofoto.de-Hydra_15.jpg
https://upload.wikimedia.org/wikipedia/commons/thumb/5/5c/Aurelia_aurita_2.jpg/512px-Aurelia_aurita_2.jpg
https://www.flickr.com/photos/volvob12b/14231557292