1st September 1989 was a critical date for the water industry in England and Wales. It was the date which signalled the reorganisation of the water industry through the process of privatisation. Yorkshire Water Plc became one of the ten Water Service Companies (WSCs) in the UK formed by the Water Act of 1989. Its core responsibility was to provide water supply and sewerage services to an area of over 13,000 sq km in Yorkshire. This meant providing drinking water to over 4.5 million people and treating effluent from people and industry to an equivalent of 7.5 million people.

1. What are some examples of cnidarians? In which environments can these animals be found?

2. What are the two main morphological patterns of cnidarians? Concerning locomotion, how are these forms different from each other?

3. Concerning tissue complexity, how different are cnidarians from poriferans?

4. Which germ layers are present in cnidarians? Which tissues do they produce?

5. Why is the digestive system of these animals considered incomplete?

6. What type of digestion occurs in cnidarians?

7. What are cnidocytes? What is the name of the organelle inside cnidocytes? What are the biological functions of this structure?

8. How is nervous tissue distributed in cnidarians?

9. What types of reproduction are used in cnidarians?

10. What type of asexual reproduction occurs in Hydra?