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(a) List any two main feature of chordates. 

(b) Name the classes of vertebrates which have the following characteristics: 

(i) Animals have streamlined body and gills for breathing. 

(ii) Animals are found both on land and in water. 

(iii) Animals have mammary glands for the production of milk to nourish their young ones.

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The two main features of chordates are: 

(a) 

(i) They have notochord (ii) They are true coelomate animals and triploblastic. 

(b) 

(i) Pisces have streamlined body and gills for breathing 

(ii) Amphibians are found both on land and in water 

(iii) Mammals have mammary glands for the production of milk to nourish their young ones.

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