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1956

The major mineral present in the shell of Molluscs is________

  • A. Copper
  • B. Sodium
  • C. Iron
  • D. Calcium
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1957

The digestion of proteins starts in the______

  • A. small intestine
  • B. stomach
  • C. large intestine
  • D. mouth
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1958

Tooth decay is usually caused by___________

  • A. undigested and absorbed food
  • B. eating a limited amount of sweetened food.
  • C. the bacteria ín the mouth that metabolize sugar to acids
  • D. eating a lot of proteinous foods
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1959

The conversion of ammonium salts into nitrates is called_______

  • A. putrefaction
  • B. denitrification
  • C. fixation
  • D. nitrification
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1960

The salinity of a brackish habitat________

  • A. increases immediately after rainfall
  • B. increases at the end of the rain
  • C. decreases with an increase in the number of organisms
  • D. increases during the dry season
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