The mouth of a river opening into the sea is termed as

A. shore line

B. littoral zone

C. continental shelf

D. estuary

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  1. Which organism probably arrived first in the world?
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  3. The hormone that contains iodine is
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  5. The function of connective tissue is
  6. The disease in which blood clotting does not take place is known as
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  19. Mutations could be created by X-rays. This was found by
  20. Scrub jungle Is characterised by
  21. The study of ecology with pyramids was invented by
  22. The part of the eye behind the lens is filled with
  23. Malarial parasite is brought to human host by
  24. The first person to observe the bacteria, protozoa and spermatozoa under the microscope was
  25. Which of the following plays an important part in photosynthesis?
  26. Xerophthalmia is a deficiency disease. Deficiency of _________ causes it.
  27. Dr Khorana's work relates to
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