PRoni.KM I. The Ki/ids of Anhfiah of the Earth 67 



8. Cite several examples (jf true bugs. Of what importance to man are 

 plant lice and scale insects? 



9. How can you recognize beetles? List some well known examples. 



10. List four common kinds of social insects. Why are they called social 

 insects? Describe the life history and the community life of ants. 



11. How do bumblebees differ from honeybees? Name and describe the 

 different kinds of bees in a hive. Describe the life of the worker bees. 

 Describe swarming. 



12. Of what importance are termites? 



13. State three respects in which spiders differ in structure from insects. 

 From what is the spider's web built? How is it used? 



14. What can you say of the danger of being bitten by spiders? 



15. Describe four close relatives of the spider. 



16. How do the thousand-leggers resemble worms? Why are they classed 

 as arthropods? Distinguish between centipedes and millipedes. 



17. Name several crustaceans. Where do most crustaceans live? 



18. What are some of the peculiar characteristics of lobsters, of crabs, and 

 of barnacles? 



19. Mollusks are divided into three groups. Name one example of each. 

 What have these three in common? How do they differ? Describe 

 the shells of mollusks. 



20. Describe a snail with a shell. What is a slug? 



21. State how the mollusks are useful to man. How are they harmful? 



22. Cite an example of an animal that has bilateral symmetry and one that 

 has radial symmetry. Explain these terms. What are the striking 

 characteristics of the invertebrates with spiny skins? Name some 

 examples of this group. 



23. Describe the starfish. Include: their appearance, where they live, how 

 they move about, what they feed on, and how they eat. Define regen- 

 eration. 



24. What are three large groups of worms? What do earthworms eat and 

 how are they of importance to us? Why are earthworms said to be 

 segmented? How are leeches of interest to us? 



25. In what two respects do roundworms differ from earthworms? What 

 roundworm causes a disease? 



26. What two kinds of flatworms live in other animals? Describe one 

 kind. 



27. Describe the appearance and structure of a sea anemone. 



28. Which relatives of the sea anemone live in a limestone shell? Explain 

 how coral reefs are formed. 



29. The jellyfish is a third type of animal whose body is a simple sac. 

 How does it differ in its habits from sea anemones and coral animals? 

 Explain how it carries on locomotion. 



30. Sum up the characteristics of the animals in this group of coelen- 

 terates. 



