Question: After the Second World War, the British welfare state was further strengthened. The welfare programme offered citizens an education, an opportunity to find a job,

After the Second World War, the British welfare state was further strengthened. The welfare programme offered citizens an education, an opportunity to find a job, adequate housing, free healthcare and financial support in times of special need. The state guaranteed a certain minimum level of provision that did not depend on people's ability to pay. If people wanted something better, then they were free to find it and pay for it.

1. What are the best known representatives of the Platyhelminth phylum?

2. What is the main external morphological feature that differentiates platyhelminthes from other worms (nematodes)?

3. How many germ layers make up the body of platyhelminthes? How are they classified according to this feature?

4. What are the types of digestion and digestive system of platyhelminthes?

5. How are nutrients distributed by the digestive system in planaria?

6. How is gas exchange carried out in flatworms?

7. Poriferans and cnidarians do not have excretory systems. Do platyhelminthes have an excretory system?

8. What is an example of a freshwater flatworm? What physiological problem must these animals solve when living in that environment?

9. Is the nervous system of platyhelminthes more or less sophisticated than that of cnidarians? What are the main neural structures found in flatworms? How is this neural organization important for the diversity of ecological niches explored by species of the phylum?

10. What is cephalization? How does lateral symmetry favor cephalization?

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