1. Why are horseshoe crabs called "living fossils?" What evidence can be used to support your response? 1 point.

2. List two functions of the telson. 1 point.

3. Describe book gills. State what you think book gill morphology provides? Why not just gills? 1 point.

4. What reason can you develop to explain why male sea spiders, instead of females, have ovigers? Explain why sea spiders use the areas inside their legs for digestion processes. 1 point.

5. What is an acarologist? 1 point.

6. Some spiders eat their silk. It seems obvious that they do this for nutrition, so what types of molecules are spiders obtaining by ingesting silk? 1 point.

7. What reason can you give for spider venom being poisonous to humans? 1 point.

8. What seemingly effective method of escape is used by opilliones that could not be used by a squirrel? 1 point.

9. Some humans that are bitten by an infected tick of the genus Ixodes are infected with Lyme disease and some humans are not. Explain your understanding of why this can happen. 1 point.

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