2. The large opening at the top of the sponge is called the

3. Which of the following is NOT what a sponge skeleton can be made of?

4. Choanocytes are also known as _____.

5. Sponges feed by filtering _____________ out of the water column as it passes through the spongocoel.

7. What are stinging organelles with a coiled thread found in the tentacles which are used to capture prey or defend against predators?

This picture of a sea anemone would represent which form of a Cnidarian?

Ctenophora is commonly called as:

The function of Flame cells are:

Cnidarians were the first animals to develop _____________ cells so they could react to their environment.

Which phylum first developed a mouth with a central digestive area due to the two cell layers, endoderm and ectoderm.

Platyhelminthes are best described as