The document discusses lower invertebrates and provides review questions about their characteristics and complexity. It asks questions about the simplest and most complex invertebrate phyla, types of symmetry, and parts of the crayfish. Review questions cover characteristics of flatworms and roundworms, differences in complexity between sponges and mollusks, common characteristics among listed groups, and types of symmetry. The document then shifts to discussing higher invertebrates and provides additional review questions comparing them to lower invertebrates.

1. Lower Invertebrates

2. Warm up: TAKE OUT A SHEET OF PAPER… 1. What is the simplest invert phylum? 2. What is the most complex invert phylum? 3. What is the most complex form of symmetry? 4. What is the name of the front portion of the crayfish? 5. What is 1 question you still have about inverts?

3. Lower Invertebrates

4. Lower Inverts Review Questions 1. What characteristics do flatworms and roundworms have in common? 2. Sponges are the simplest organisms and mollusks are much more complex. Use information from the chart to explain this. 3. What characteristics are the most common among the groups listed in the chart? 4. What are the three types of symmetry?

5. Higher Inverts…

6. Higher Inverts…

7. Higher Inverts Review Questions 1. What characteristics do the higher invertebrates have in common? 2. Sponges are the simplest organisms and echinoderms are much more complex. Use information from the 2 charts to explain this. 3. Why are the animals in this chart much more advanced than those in your lower inverts chart? (give specific data from your chart to support your answer)