What is true of the number of species alive on Earth today?

+3 votes

 

  

Land plants have the greatest number of species.

  

Though we don't know the exact number of species, we do know what the upper limit (the maximal number) of species is.

  

We know the exact number of extant species.

  

Though we don't know the exact number of species, we do know what the lower limit (the minimal number) of species is.

 

asked Jan 3, 2013 in Biology by anonymous
    

1 Answer

+1 vote

 

Though we don't know the exact number of species, we do know what the lower limit (the minimal number) of species is.

 

answered Jan 3, 2013 by Panda ~Expert~ (1,557 points)

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