question_answer

  (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.           

Answer:

·              (a)Chordates have notochord and dorsal nerve chord and they are triploblastic. (b)(i)Pisces have stream lined body and gills for breathing. (ii) Amphibians are found on both land and in water. (iii) Mammals have mammary glands for production of milk to nourish their young ones.