Marisa Van Dusen
Platyhelminthes 
The major type of Platyhelminthes are Flatworms. 
Red Marine Flatworm
Since most Platyhelminthes are wormlike organisms their body structure is said to exihibit a acoelomate body plan...
Meaning they lack a cavity between their 
body wall and  their digestive track
Like most organisms they 
have bilateral symmetry. 
example of bilateral symmetry
Platyhelminthes move using layers of muscles 
to move themselves along...  
A flatworm which is the main example of Platyhelminthes, has a combination digestive/excretory system. 
Flatworms reproduce by sexual reproduction
since they have both male and female parts. But
also asexual by splitting. Interestingly enough each piece that is split off it becomes a seperate worm.
Some worms are harmful like tapeworms...
They excrete toxic waste, absorb nutrients, and may block the intestines of its human host.
Tapeworm
Some Platyhelminthes have rhabdites which are specialized epidermal cells and extracellular structures  which aid in locomotion (moving from one place to another)
If you are interested in buying a Platyhelminthes they can be yours today for the low cost of 7.95. They look beautiful in a aquarium and they make a lovely gift. And if you act soon shipping and handling is on us. 
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Annelida

The major type of Annelidas are Earthworms
The body sctructure of Annelidas are bilaterally symmetrical. 
Earthworms can move using small muscles in their body to crawl. 
Unlike most organsims Earthworms don't have to look for their food. Their food is all around them. They eat the decaying matter in the soil. 
Earthworms are hermaphrodites, meaning that they have both the male and female parts and are able to reproduce on their own.  But they  are also able to mate with each other. 
Now as you can imagine Earthwoms aren't exactly very helpful to us humans, but there are some Annelidas that are for example Leeches are... they help us by in some cases restoring normal blood flow in certain parts of the body. 
Unfortunatly there are no "special" cells in Annelids so we just say that they are all special. : )
If you are interested in buying a Annelida we are having a "special" sale. As of today they are 50% off meaning they are now a low 5.99 for a pair of them. 
The End