Economies change over time. Firms come and go, industries rise and fall, new jobs are created, old ones disappear. Some areas flourish, others decay. Throughout all this, people try to stay in work. Many succeed, but some don't. The challenge to them and to the government is to find them another job before they lose heart, stop searching, and are lost from the labour force. Over the past twenty years, successive governments have looked to improve the way the labour market works. For people to obtain jobs, they must know that a vacancy exists. They also need the education and training that the vacancy requires, so governments have looked to improve job advertising and job training. That is not enough, however. People need to feel motivated about taking a job. Being employed has to be made to look attractive and rewarding. Guaranteeing a minimum wage has a part to play, but so does reform of the tax and social security system, so that people keep more of the money they receive as a result of being employed rather than unemployed.

1. What are some examples of annelids?

2. Which morphological features differentiate the members of the phylum Annelida from nematodes and platyhelminthes?

3. What is the key innovation in annelids?

4. What morphological characteristic suggests proximity between organisms of the phylum Annelida and arthropods?

5. How does digestion in organisms of the phylum Annelida take place? What type of digestive system do they have?

6. Which features and organs of the digestive system of earthworms are related to their diet?

7. The vascular lesions caused by leeches on the blood vessels of their host cause blood to coagulate naturally. How does the leech solve the problem of the ingested blood potentially coagulating inside its body?

8. How is the respiratory system of species of the phylum Annelida characterized?

9. What is meant when it is said that organisms of the phylum Annelida are vascular organisms? From which other phyla of the animal kingdom does this feature differentiate them?

10. How are the circulatory systems of animals classified?