If You Live on a River Delta or Coastline,you May

question 18

Multiple Choice

If you live on a river delta or coastline,you may not be able to eat the local shellfish because of high levels of toxins present in the water.Why?

• A)Clams seasonally produce toxic substances.
• B)Shellfish regularly consume poisonous red tide organisms.
• C)Most harmless native clams have been replaced by bad species.
• D)Clams filter-feed and concentrate the dilute pollutants from the water,thus acting as early warning indicators of severe pollution.
• E)The toxins contained in the shellfish can't be broken down by your stomach.

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