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algae

Pronunciation:  aL-jE
  
Definition :singular: alga; plant or plant-like organisms that live in water and contain chlorophyl (used to convert sunlight to food)
  
Facts: Algae, in the presence of fertilizers like nitrogen, can bloom. Algae blooms will use all of the available oxygen during this growth spurt--this causes all other plants and animals to die off.

The Dead Zone in the Gulf of Mexico is an area that cannot support plant or animal life. Scientists believe that algae blooms may cause the Dead Zone.