THE LIFE OF AN ANIMAL 297 



EXERCISES 



1. Name three differences between simple and complex organisms. 



2. What is the function of the nervous system? 



3. Name three sense organs. 



4. Of what use are the sense organs in our finger tips? 



5. Give an example of an animal that has a keen sense of smell; of 

 hearing; of sight. 



6. (a) Give an example of instinct shown by a bird. (6) An ex- 

 ample which shows that some animal has been taught by man. 



7. What are vertebrates? Name four different examples. 



8. How do muscles act to produce motion of a part of the body? 



9. Give some illustration of antagonistic muscles not mentioned 

 in the text. 



10. On which side of a fish's body is the muscle which moves the 

 tail to the left? What is that kind of muscle called? 



