1) Which two animal phyla are considered to be on the “multicellular” level of organization, lacking true tissues? How do you expect them to differ in their embryonic development compared to other animals? 2

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1) Which two animal phyla are considered to be on the “multicellular” level of organization, lacking true tissues? How do you expect them to differ in their embryonic development compared to other animals?

2. During which stage of embryonic development is the blastopore and digestive cavity formed?

3. What are the three primary germ layers? Which is missing in diploblastic organisms?

4. What type of symmetry is associated with diploblastic organisms? Which phylum is the exception to this rule and why?

5. Describe the 3 main developmental differences between protostome and deuterostome animals.