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

question 2

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,even though you may be able to drink the water taken from the same source.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• C) Most harmless native clams have been replaced by bad species.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, but toxins in the water can be.

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