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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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  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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  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
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  27. Dr Khorana's work relates to
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