The marine animal called dugong which is vulnerable to extinction is a/an

A. Amphibian

B. Shark

C. Bony fish

D. Mammal

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  1. The speed of light with the rise in the temperature of the medium
  2. The metallic constituents of hard water are
  3. Which of the following elements is non-radioactive?
  4. The removal of top soil by water or wind is called
  5. Earth's seasons are caused by which of the following?
  6. When a gas is turned into a liquid, the process is called
  7. In an atomic nucleus, neutrons and protons are held together by
  8. The metal used in storage batteries
  9. The hardest substance available on earth is
  10. The property of a substance to absorb moisture from the air on exposure is called
  11. Which of the following is most likely to cause a rise in the average temperature of earth's atmosphere…
  12. Glass is made from the mixture of
  13. What is the unit for measuring the pitch or frequency of sound ?
  14. The element present in the largest amount in rocks and minerals is
  15. Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of
  16. Rust is
  17. The oxide of Nitrogen used in medicine as anaesthetic is
  18. Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?
  19. The location and energy of an electron in an atom can be specified by
  20. Permanent hardness of water can be removed by adding
  21. Lightening cause rainfall because
  22. Pollination by birds is called
  23. Apparatus invented by Archimedes is :
  24. According to Daltons atomic theory the smallest particle which can exist independently is
  25. The recent atomic weight scale is based on
  26. In a certain electronic circuit the output is positive if input 1 is positive and input 2 is zero. If…
  27. Which of the following characters is not shown by hydrogen
  28. The accumulation of stress along the boundaries of lithospheric plates results in which of the following?
  29. The solar eclipse occurs when
  30. Old-written material, which cannot be read easily can be read by