Class Response Blog #4 :]

For the past two weeks or so, I have been learning about Sponges and Cnidarians in my science class. What I learned about these underwater animals are about their body structures, how they obtain food and oxygen, and how they reproduce. Here are some facts about each of these creatures:
Sponges

Sponges are asymmetrical, which means they don't have any lines of symmetry.
Sponges stay attached to a solid surface and they don't swim.
Sponges obtain food and oxygen by filtering the water that flows through their bodies and taking the oxygen from that water.
Sponges reproduce asexually (budding) and sexually.
Sponges are invertebrate, which means that they don’t have a backbone.
Sponges have spikes they use to protect their soft inner parts of their body.

Cnidarians

Cnidarians are invertebrates.
Cnidarians have two basic structures called medusa and polyp.
Cnidarians have radial symmetry.
Medusas are weak swimmers so they rely on water currents to move them.
Polyps don’t move at all, they attach themselves to a solid surface.
Cnidarians have stinging cells and tentacles that they use to capture and obtain their food.
Cnidarians reproduce sexually and asexually.

In my opinion, I liked learning these intresting facts on these underwater creatures and I would like to learn more about them soon! ~Vikinggirl15<3

Here are some links to some pictures of cnidarians and sponges: (:

http://www.arcodiv.org/watercolumn/cnidarian/images/Chrysaora_melanaster_400x300.jpg

http://www.ryanphotographic.com/images/JPEGS/Sponges%20vertical.jpg

http://saltwater-aquarium-guide.net/images/sponge.jpg