1. Which class of animal has skin with fur or hair, feeds their young milk and maintains a constant body temperature? a. Mammals b. Birds c. Reptiles d. Birds 2. Which reptiles are characterized by the presence of four-chambered Heart? a. Turtle b. Tortoise c. Lizard d. Crocodile 3. forelimbs in birds are: a. Absent b. Only hind limbs are present c. Modified into wings d. Rudimentary 4. Which animals do not belongs to class pisces? a. Sea-horse b. Shark c. Whale a. Electric ray 5. Which of following is not a fish? b. Shark c. Eel d. Electric ray e. Jelly fish​