1. Fish breathe through   Gills   Fins   Lungs   Skin   Hint Half-n-half Clue   2. The feathers of birds are good insulators.   True   False   3. How many teeth does an average human adult have?   33   36   32   31   Half-n-half Clue   4. What is the pulse rate of an average healthy human being?   72 beats per minute   16 beats per minute   100 beats per minute   65 beats per minute   Half-n-half Clue   5. Which of the following are known as "aves"?   Reptiles   Mammals   Fish   Birds   Half-n-half Clue   6. Which of the following animals is not extinct?   Mammoth   Cheetah   Dodo   Brontosorus   Half-n-half Clue   7. The response of plants to light is known as   Chemotropism   Thigmotropism   Hydrotropism   Phototropism   Half-n-half Clue